Notes 7

☣

Immersive 3D for the Real World | Matterport
Matterport | IT桔子
Home page - Wikipedia @
A home page or a start page is the initial or main web page of a website or a browser. The initial page of a website is sometimes called main page as well.

【Home page vs. homepage】 falls into the same category as website and Web site as well as motor home and motorhome. Originally, the words homepage, website, and motorhome did not exist, but after so much usage over the years it has become acceptable to combine the two words into one.

In other words, either way is fine.

很多单词都是这么演化的。

我决定以后用“homepage”。

refs and see also
- Definitions of homepage - OneLook Dictionary Search
OnlineStylebooks.com: Alphabetical List @
各种 style guide，建议读一个。

refs and see also
- Wikipedia:Manual of Style - Wikipedia
functional Java 函数式版的 Java（A Little Java, A Few Patterns）书评 @
refs and see also
- class design in a little java, a little pattern? - Stack Overflow
我和 Leanote @
这货居然有修改回放……不知道用了哪一个库……Orz 好牛逼。我也想有。

refs and see also
- leanote/markdown-editor-v2: Markdown Editor V2 (Support Vim & Emacs Mode) For Leanote Web & Leanote Desktop App
osx - How can I Remove .DS_Store files from a Git repository? - Stack Overflow @
(git remove file)

Remove existing files from the repository:
```
find . -name .DS_Store -print0 | xargs -0 git rm -f --ignore-unmatch
```
Add the line
```
.DS_Store
```
to the file .gitignore, which can be found at the top level of your repository (or created if it isn’t there already). Then
```
git add .gitignore
git commit -m '.DS_Store banished!' # 被驱逐了
```
小结：
- 如何 banish 一些已经 track 了的文件？
- git rm -f –ignore-unmatch
README | Keep Writing Codes / 生活的乐趣就在于此 @
我喜欢 Matrix67 所著思维的乐趣一书中序言的一个小段子：

学生：“咱家有的是钱，画图仪都买得起，为啥做图只能用直尺和圆规，有时还只让用一个？”

老师：“上世纪有个中国将军观看学生篮球赛。比赛很激烈，将军却慷慨地说，娃们这么多人抢一个球？发给

他们每人一个球开心地玩多好。”

数学文化微博评论：生活中更有意思的是战胜困难和挑战所赢得的快乐和满足。

是的，生活的乐趣就在于此。

USTC 居然还有这样的镜像。

refs and see also
- jiacai2050/gooreplacer4chrome: 一个用于替换网页中 Google Fonts/API/themes 等的 Chrome 插件，让你快速打开引用这些资源的页面 :-)
我所遇到过的入门好书 | 小心地滑 @

啊兮吧

这本“巫师书”实在是太出名了，常常被简称为 SICP（Structure and Interpretation of Computer Programs），是 MIT 的课本（课程代号 CS6.001）。这门课从 1980 年一直教到 2008 年，横跨近三十年。也说明这是一本经得起时间考验的课本。

1986 年，该课程的两位老师（也是这本书的作者）Hal Abelson 和 Gerald Jay Sussman 给惠普员工做了一次全套讲座，讲座全程录像，也是这门课在历史上留下的唯一的视频资料（绝对渣画质）。本书可以免费在线阅读，机械工业出版社出过中文版。

还有一个 python 版本的，内容基本一样。
互联网陨落的巨星——Mozilla 前世今生 - V2EX @

偶尔无聊一下是为了大部分时候不无聊，吗？
网上付费查开房记录，人生轨迹等是怎么做到的？ - V2EX
为什么很少见工资高的程序员炫富？ - 匿名用户的回答 - 知乎 @

我公司领导们并不知道我其实也是有点儿想走的，但我一定要把不顾后果把我开除的责任全部留给他们。

像我这么重要的人竟然可以不用工作交接就直接让我走人，我只能说公司里那帮经理真的是根本不在乎毁掉一个两个产品。（哈哈哈，“像我这么重要的人”……）
为什么香港的 IT 行业平均薪酬较低？ - 知乎 @

三. 说实话，和 HK 相比，国内 IT 界才是个人傻钱多的领域。其实国内任何领域都是人傻钱多，只要你找对地方。而 HK 没有这样的地方。老罗演讲里说，任何行业都是三成的经营 + 七成的 SB 构成的，只要你能去到那 7 成 SB 的公司，然后唬住那些 SB，你就可以轻松拿高薪。而在 HK，没有过硬的技术很难混事儿，光靠吹牛扮高深考一堆证也绝对是没好果子吃，HK 要求你考一堆证，而且，更要求你有和这些证书匹配的能力。
没见过大蛇屙尿 @

林愈静-顾家男
MISC @
Vim, 蛋疼的服务器上有 number-lines 的话，可能显示会出问题，所以 set nonu！

计算机还没有出现之前，有一种叫做电传打字机的玩意，每秒钟可以打 10 个字符。但是它有一个问题，就是打完一行换行的时候，要用去 0.2 秒，正好可以打两个字符。要是在这 0.2 秒里面，又有新的字符传过来，那么这个字符将丢失。于是，研制人员想了个办法解决这个问题，就是在每行后面加两个表示结束的字符。一个叫做“回车” \r，告诉打字机把打印头定位在左边界；另一个叫做“换行”\n，告诉打字机把纸向下移一行。这就是“换行”和“回车”的来历，从它们的英语名字上也可以看出一二。后来，计算机发明了，这两个概念也就被般到了计算机上。那时，存储器很贵，一些科学家认为在每行结尾加两个字符太浪费了，加一个就可以。于是，就出现了分歧。Unix 系统里，每行结尾只有“<换行>”，即“\n”； Windows 系统里面，每行结尾是“<回车><换行>”，即“\r\n”；Mac 系统里，每行结尾是“<回车>”。一个直接后果是，Unix/Mac 系统下的文件在 Windows 里打开的话，所有文字会变成一行；而 Windows 里的文件在 Unix/Mac 下打开的话，在每行的结尾可能会多出一个 ^M 符号。

在 vim 中可以通过 Control+V Control+M 来输入 ^M。

几种去除 ^M 的方法
```
1、 cat filename1 | tr -d "\r" > newfile
2、 sed -e "s/^V^M//" filename > outputfilename
3、 vi： 用 vi 打开文件，输入 :%s/^M//g
4、 dos2unix
```
refs and see also
- vi/vim 显示中文字符并且去掉 ^M 的方法 - fooboo - 博客园
- [^M and vim](http://www.linuxquestions.org/questions/linux-software-2/%5Em-and-vim-213557/)
当你的生活变成一坨屎的时候，通常都是因为你当时做的傻逼决定。 —《死侍》

git diff
- --src-prefix=<prefix> -> a/
- --dst-prefix=<prefix> -> b/
- --no-prefix
之前用 git diff 和 aha：
```
#!/bin/bash

output=$1
obasename=`basename ${output}`
a=${obasename%.*}-a.md;
b=${obasename%.*}-b.md;

(cat _a.md; \
tail -n +4 ${a}; \
cat _b.md; \
tail -n +4 ${b}; \
cat _c.md; \
(git diff --color-words --no-index ${b} ${a} | ./aha);
cat _d.md; \
) | \
pandoc -f markdown+hard_line_breaks --self-contained -S -s --ascii -c _main.css -o $output
```
豆瓣的共识大概就是：

同志骄傲，八组死妈，我不结婚，以及上班使人变丑。

武汉男人更简单，人到中年每个都会变成大货车司机一样的人物，公司里拍上级，骂下属，在家装作顶梁柱主心骨，在外冒充扫地僧。同时总有最低限度的三观和最小的胆量，对强势者极其巴结，对弱势者拼命踩踏。 (一黑黑两个系列)

如果说顶尖的技术人员是重点文物，那么顶尖的产品经理就真的是稀世孤品啦。说到底，工程技术这些打怪练级，多数还是有个清晰的路径反馈，是“可培养的”。产品经理怎样培养？技术圈每年成吨的框架，产品呢？改变世界的产品几乎是以年为单位计量的。十年啦，我们还处于 iPhone 的时代，不是吗？

（路径反馈是啥么鬼……）

蒙古的领导者真是群神经病，经济主要是矿产出口，严重依赖中国，结果还在主权问题上刺激中国，中国就增加点过路费治了他一下，就哭爹喊娘向印度求援，希望印度能阻止中国对蒙古的制裁，这是什么结果显而易见，现在没办法了，又向中国道歉服软，希望蒙中关系重回正轨，看来蒙古的病真是不轻，得电。

特朗普在其推特上发文称：“今天，土耳其、瑞士和德国都发生了恐怖袭击——现在的情况变得越来越糟糕。文明世界必须转变思考方式!”
雷洋案 5 警渎职检察院不起诉 - 特写 - 经济通中国站 @

检察院查明，事发当晚邢等人发现雷洋在一间足疗店接受性服务后离开，怀疑他嫖妓便立即追赶。雷洋试图逃跑，其间警方把他抱腰摔倒，用脚踩他的颈面、掌掴他，强行拖上车。

后来雷洋瘫软不再挣脱，邢等人未及时急救，待之后送院雷已不治。按司法鉴定，雷洋因胃内容物吸入呼吸道致窒息死亡，与警方曾称其“心脏病发”不符。
China Xinhua News on Twitter: “Big plans! China issues white paper on space development. Missions to Moon and Mars, and many more. Find out https://t.co/0Y49YrMKQw”
Mastering Vim Quickly - Jovica Ilic @

Master Vim Quickly – From WTF to OMG in no time

Over the years, Vim got a reputation - that it’s really difficult to learn it. I’ve heard many times from guys who are convinced it will take them months to reach proficiency.

That’s simply wrong. That’s why I’m writing a book: Mastering Vim Quickly (from WTF to OMG in no time) which will teach you Vim the way I learned it – easily and quickly.

sparanoid/lightense-images: A dependency-free pure JavaScript image zooming library less than 2 KB (gzipped). Inspired by tholman/intense-images @

<img src="photo.jpg">
<script src="lightense.js"></script>
<script>
  window.addEventListener('load', function () {
    var el = document.querySelectorAll('img');
    Lightense(el);
  }, false);
</script>

终于知道知乎网红轮子哥的编程水平了 - V2EX @
还是多此一举解释一下吧

65k 端口数限制的前提是源 ip, 源端口, 目标 ip, 目标端口这四个变量固定前三个变量之后才有的

c100k 问题固定的变量只有前 2 个，所以加上目标 ip 这个变量，理论连接数可以有无数多个，也就是说，如果一个 IP 后面可以堆一堆机器的话，是可以有远超百万级这个数量的连接的

如果不信的话，你去 dig 一下 12306.com 看一下这个域名绑了多少个 ip ，假设是 100 ，然后就可以得出 12360 只能服务最多六百万用户的可笑结论了

至于截图的内容，说实在我还是有点惊讶的，其它就没啥可说的了

0-65535 是端口范围值，不是端口连接数量，昨服务服务端的话，程序业务需要，一般也只是开启一个端口来号监听客户端过来的连接，理论上链接数量无限，看机器性能和程序系统优化。

轮子哥几年前来我们学校给我们涨姿势的时候……说他大学很多科目都是低空飘过的刚毕业和面试官也没少撕过所以。看到某乎得这事内心毫无波动

refs and see also
- web server - How do high traffic sites service more than 65535 TCP connections? - Server Fault
the_platinum_searcher/README.md at f4754bcef7b80d4c2f8a45fc9ce1ea33c641b7ef · monochromegane/the_platinum_searcher @
If you put configuration file on the following directories, pt use option in the file.
- $XDG_CONFIG_HOME/pt/config.toml
- $HOME/.ptconfig.toml
- .ptconfig.toml (current directory)
```
color = true
context = 3
ignore = ["dir1", "dir2"]
color-path = "1;34"
```

Maven Repository: org.apache.commons » commons-io » 1.3.2 @

<dependencies>
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-io</artifactId>
        <version>1.3.2</version>
    </dependency>
</dependencies>

文件移动。FileUtils。

GitHub vs. Bitbucket vs. GitLab vs. Coding – flow.ci – Medium
Perl from command line: substitute regex only once in a file - Stack Overflow @
```
perl -i -pe '$done ||= s/old/new/' filename
perl -i -pe '$i = s/old/new/ if !$i' filename
perl -i -pe '$x++ if $x==0 && s/old/new/;' filename
```
-i 和 -i.bak 应该是一样，因为默认的 backup 后缀就是 “.bak”。
perl-5.22.0 - The Perl 5 language interpreter - metacpan.org @
这是 Windows 上 git 2.7.2 自带（内含）的 perl，感觉还是很新很强大啊！还新提供了一个钻石运算符（<<>>）

New double-diamond operator @

<<>> is like <> but uses three-argument open to open each file in @ARGV. This means that each element of @ARGV will be treated as an actual file name, and “|foo” won’t be treated as a pipe open.

从一个 perl 爱好者的角度来看，perl 6 还任重道远。
file io - Why is three-argument open calls with autovivified filehandles a Perl best practice? - Stack Overflow @
open(OUT, '>>', $file); three-argument open

open(OUT, ">>$file"); two-argument open

Using typeglobs for filehandles (like OUT) is not a good idea, as they are global across your entire program - you need to be sure that no other routine including those in modules are using the same name (including in the future).

Using the two-argument form of open exposes your application to mis-behaviour caused by variables containing special characters, for example my $f; open $f, ">$some_filename"; is exposed to the bug where $some_filename containing a leading > will change the program’s behaviour. 这个太屌了……这样的 bug 说不定很多……好多漏洞。

Using the three-argument form avoids this by separating the mode and filename into separate arguments where they can’t interfere.

Moreover, using the lots-of-arguments form with pipes is a very good idea:

open $pipe, '|-', 'sendmail', 'fred@somewhere.fake';

Is better than doing it all as a single string – it avoids possible shell injection etc.

# 打印 dir 指令的输出。 open $pipe, '|-', 'dir'; while(<$pipe>) { print $_; }
```
open( my $input_fh, "<", $input_file ) || die "Can't open $input_file: $!";
my @lines = <$input_fh>;
my $text = join('', <$input_fh>);
```
Nowadays, I use
- File::Slurp for small files that I want to hold completely in memory, and
- Tie::File for big files that I want to scalably address and/or files that I want to change in place.
refs and see also
- What’s the best way to open and read a file in Perl? - Stack Overflow
Opening statement - Wikipedia @

An opening statement is generally the first occasion that the trier of fact (jury or judge) has to hear from a lawyer in a trial, aside possibly from questioning during voir dire. The opening statement is generally constructed to serve as a “road map” for the fact-finder. This is especially essential, in many jury trials, since jurors (at least theoretically) know nothing at all about the case before the trial, (or if they do, they are strictly instructed by the judge to put preconceived notions aside). Though such statements may be dramatic and vivid, they must be limited to the evidence reasonably expected to be presented during the trial. Attorneys generally conclude opening statements with a reminder that at the conclusion of evidence, the attorney will return to ask the fact-finder to find in his or her client’s favor.

md2html/cat.pl at aeaffd09097c7ed970c11acdfb805c452e96b0c8 · district10/md2html @

感觉自己写的这个还不错。（现在看起来……这个版本好老好基础。）

#!/usr/bin/perl

# Usage:
#       $ perl cat.pl INPUT_FILE > OUTPUT_FILE

use 5.010;
use strict;
use File::Basename;
use Cwd 'abs_path';

sub inList {
    my $needle = shift;
    my @haystack = @_;
    foreach my $hay (@haystack) {
        if ( $needle eq $hay ) { return 1; }
    }
    return 0;
}

sub unfold {
    my($PADDING)  = shift @_;
    my($FILENAME) = shift @_;
    my($FULLNAME) = abs_path($FILENAME);
    if (&inList($FULLNAME, @_) == 1) {
        print STDERR "ERROR! Loop detected: "."[$FULLNAME]-->"."{@_}"."\n";
        print      "\nERROR! Loop detected: "."[$FULLNAME]-->"."{@_}"."\n\n";
        return;
    }
    unshift(@_, $FULLNAME);

    open my $INPUT, '<', $FILENAME;
    while(<$INPUT>) {
        if (/^(\s*)\@include <-=(.*)=/) {
            &unfold($PADDING.$1, dirname($FILENAME)."/".$2, @_);
        } else {
            print $PADDING.$_;
        }
    }
}

&unfold("", $ARGV[0]);

一个 javascript 条码打印机程序给我的惊喜 - 简书
巅峰之后，看轻了观众（攻壳机动队2：无罪）影评 @

攻克系列目前包括两部电影版和两部 TV 版，几乎都是难以逾越的杰作。《Ghost in the shell》是最早的一部，也是迄今为止评价最高的，最令人疯狂的。 fans 们对这部片子的追捧到了“如果我认为你不够格，我就不会给你”看的地步。
Multiple View Geometry - Lecture 1 (Prof. Daniel Cremers) – 搜库
What is git diff --patience for? - Stack Overflow
咯咯精的广播 /PPT karaoke @

今天社会学系的朋友告诉我德国人发明的一种恐怖游戏，名叫“PPT karaoke”。大家从网上下一堆乱七八糟的 ppt，然后盲讲，你根本不知道下一页是什么还得自圆其说。还分小组赛和个人赛。太可怕了这游戏只能是 workaholic 发明的。 #fuckGerman#
Sometimes, the old ways are the best | teideal glic deisbhéalach @

The “old ways” in the title refer to the fix: in place of a fancy streaming API, I simply allocate a single big buffer and blast the bytes straight into it.

For that pathological string with almost a megabyte of consecutive backslashes, the new implementation is 27x faster and uses 42x less memory, all for the cost of perhaps an hour of Sunday evening hacking (including a little enabling work that incidentally illustrates just how easy it is to work with monad transformers). Not bad!
Better encoding error messages · Issue #1417 · jgm/pandoc @
I have bad bytes often too. It takes time to find where they are, but if you don’t care about these bytes, just use iconv to strip all invalid char sequence:
```
$ iconv -f utf-8 -t utf-8 -c input.md | pandoc -o output.html
```
- -f is the source format
- -t the target format
- -c skips any invalid sequence
See linux - How to remove non UTF-8 characters from text file - Stack Overflow.

You can then diff to see where the bad bytes are:
```
$ git diff --no-index --color-words <(iconv -f utf-8 -t utf-8 -c input.md) input.md
```
用 file 来检测字符编码：
```
$ echo "abc" > file.txt
$ file -bi file.txt                         # b: brief, i: mime-type and mime-encoding
text/plain; charset=us-ascii
(这是 mime-type), (这是 mime-encoding)

$ echo "abc好" > file.txt
$ file -bi file.txt
text/plain; charset=iso-8859-1
```
iso-8859-1 就是 notepad 里所说的 ANSI。
ISO/IEC 8859-1 - Wikipedia

git 乱码解决方案汇总 @

原帖地址: http://topic.csdn.net/u/20110113/19/b0d5d506-4307-428b-a61d-7974aa66a2da.html

首先要说明的是：这里介绍的方法都是大部分是本人“悟”出来的，所以网上难有流传！
好方法不能自己私藏，否则就白忙乎这几天了，分享给有需要的朋友们。如果有转载，敬请注明来自*CSDN 老邓*作品。
呵呵，给自己打广告，实在是无耻之极，权当无聊之时打字之用。
欢迎流传，为最优秀的分布式版本管理系统 Git 做宣传！！

步骤：
1.  下载：http://loaden.googlecode.com/files/gitconfig.7z
2.  解压到：<MsysGit 安装目录>/cmd/，例如：D:\Program Files\Git\cmd
3.  进入 Bash，执行 gitconfig

搞定什么了？
看看 gitconfig 的内容先：

Perl code
#!/bin/sh

# 全局提交用户名与邮箱
git config --global user.name "Yuchen Deng"
git config --global user.email 邮箱名@gmail.com

# 中文编码支持
echo "export LESSCHARSET=utf-8" > $HOME/.profile
git config --global gui.encoding utf-8
git config --global i18n.commitencoding utf-8
git config --global i18n.logoutputencoding gbk

# 全局编辑器，提交时将COMMIT_EDITMSG编码转换成UTF-8可避免乱码
git config --global core.editor notepad2

# 差异工具配置
git config --global diff.external git-diff-wrapper.sh
git config --global diff.tool tortoise
git config --global difftool.tortoise.cmd 'TortoiseMerge -base:"$LOCAL" -theirs:"$REMOTE"'
git config --global difftool.prompt false

# 合并工具配置
git config --global merge.tool tortoise
git config --global mergetool.tortoise.cmd 'TortoiseMerge -base:"$BASE" -theirs:"$REMOTE" -mine:"$LOCAL" -merged:"$MERGED"'
git config --global mergetool.prompt false

# 别名设置
git config --global alias.dt difftool
git config --global alias.mt mergetool

# 取消 $ git gui 的中文界面，改用英文界面更易懂
if [ -f "/share/git-gui/lib/msgs/zh_cn.msg" ]; then
rm /share/git-gui/lib/msgs/zh_cn.msg
fi

这个脚本解决了：

1. 中文乱码
2. 图形化 Diff/Merge
3. 还原英文界面，更好懂
其中最有价值的，就是 Git 的 Diff/Merge 外部工具 TortoiseMerge 配置。
安装 MsysGit 后，一个命令即可完成配置。
适用于 MsysGit 安装版与绿色版。

网上关于为 Git 配置 TortoiseMerge 来进行 diff 和 merge 的介绍几乎没有
（反正我没有搜索到），但我认为 TortoiseMerge 是最好用的，单文件（一个可
执行程序，绿色版，下载地址：
http://sourceforge.net/projects/tortoisesvn/files/Tools/1.6.7/TortoiseDiff-1.6.7.zip/download
实在是绝配！

为什么不使用 TortoiseGit？他们不是集成了 TortoiseMerge 吗？
理由：TortoiseGit 只有 Windows 才有，我更喜欢 git gui，结合 gitk，跨平台实在相同的操作方式，更爽！
如果您离不开 TortoiseGit，这篇文章就直接无视吧。

git 乱码解决方案汇总 http://zengrong.net/post/1249.htm
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原文 git 乱码解决方案汇总，欢迎使用文章源码进行转载。

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我一直是在 cygwin 下使用 git，辅以 TortoiseGit。使用上没什么问题，但今
天在处理一个有中文文件名的项目时却出现文件名乱码的问题。情况是这样的：

在一个使用 cygwin 的 bash 提交的 git 项目中，已经完成了所有的提交，但使
用 TortoiseGit 查看的时候，却发现仍有文件没有提交，甚至是有文件还处于未
暂存的状态。于是使用 TortoiseGit 提交；再次用 cygwin 下的 git status 查
看，这次又发现了未提交的情况。再次用 git commit 命令行提交；回到
TortoiseGit 下查看，问题又出现了！此时准备返回两次提交前的版本，却因为
文件名乱码的问题，无法返回了！搜索一番，发现 git 文件名、log 乱码，是普
遍问题，这其中有编码的原因，也有跨平台的原因。因为 git 是从 linux 移植
过来，默认采用 UTF-8 编码。而 Windows 默认使用 UTF-16 编码来保存文件名，
应该就是这些不同的处理方式造成了乱码。下面是解决方案：

乱码情景 1
在 cygwin 中，使用 git add 添加要提交的文件的时候，如果文件名是中文，会
显示形如 274\232\350\256\256\346\200\273\347\273\223.png 的乱码。

解决方案：

在 bash 提示符下输入：

git config –global core.quotepath false

ore.quotepath 设为 false 的话，就不会对 0×80 以上的字符进行 quote。中文显示正常。

乱码情景 2
在 MsysGit 中，使用 git log 显示提交的中文 log 乱码。

解决方案：

设置 git gui 的界面编码

git config –global gui.encoding utf-8

设置 commit log 提交时使用 utf-8 编码，可避免服务器上乱码，同时与linix上的提交保持一致！

git config –global i18n.commitencoding utf-8

使得在 $ git log 时将 utf-8 编码转换成 gbk 编码，解决Msys bash中git log 乱码。

git config –global i18n.logoutputencoding gbk

使得 git log 可以正常显示中文（配合i18n.logoutputencoding = gbk)，在 /etc/profile 中添加：

export LESSCHARSET=utf-8

乱码情景 3
在 MsysGit 自带的 bash 中，使用 ls 命令查看中文文件名乱码。cygwin 没有这个问题。

解决方案：

使用 ls –show-control-chars 命令来强制使用控制台字符编码显示文件名，即可查看中文文件名。

为了方便使用，可以编辑 /etc/git-completion.bash ，新增一行 alias ls=”ls –show-control-chars”

最终，还是没能解决最开始我提到的文件名提交乱码的问题。不过倒是有了一个
新发现：使用 git gui 命令，在 MsysGit 下，看到的中文文件名为正常；而在
cygwin 下，看到的中文文件名为乱码。同样的，如果一直使用 TortoiseGit（实
际调用 MsysGit）提交，那么中文文件名没问题；一直使用 cygwin 提交，中文
文件名也没问题。但一定不能交叉使用。这应该是两个平台默认处理中文文件名
的方式不同造成的。

分别设置 LANG、LC_CTYPE、LC_ALL 参数为同样的编码，问题依旧。

cygwin 官方网站提到了非拉丁语文件名的问题，也许研究后能解决该吧：Chapter 2. Setting Up Cygwin

这里还有一篇讲解 Linux 系统编码文章：locale 的设定及其 LANG、LC_ALL、LANGUAGE 环境变量的区别

貌似终极的解决办法是通过修改 git 和 TortoiseGit 源码实现的，有网友这么
做了：让 Windows 下 Git 和 TortoiseGit 支持中文文件名 /UTF-8

本文参考链接：

搞定 Git 中文乱码、用 TortoiseMerge 实现 Diff/Merge MsysGit 乱码与跨平
台版本管理git 中文文件名、目录名乱码应该怎么解决？

为什么使用 do{}while(0)? - zenghao0708 的专栏 - 博客频道 - CSDN.NET @

终于有人解释对了。之前看过豆瓣上一个辛普森头像的豆油发文说这个，简直瞎讲。
下载凭证
Markdown and including multiple files - Stack Overflow
opencv 提供了多少个特征点的 descriptor？ - 知乎
4ker/image_stitching: OpenCV’s Image Stitching samples
kushalvyas/Python-Multiple-Image-Stitching: Implementation of multiple image stitching
OpenPano: How to write a Panorama Stitcher | Yuxin’s Blog
willard-yuan/SeetaFaceLib: SeetaFace for Xcode and Qt
False Advertising. There are dependencies to this project. · Issue #248 · zenorocha/clipboard.js @

@FagnerMartinsBrack I honestly think this is super irrelevant and has nothing to do with “impact” or “meaningfulness”. There are tons of more important things to be done in this project (and in life).
JavaScript Event Bubbling and Event Propagation
How do I use boolean variables in Perl? - Stack Overflow @

1 ture, 0 false.

Can I vote perl down for not having booleans? 哈哈哈可以的。
perl-Color-ANSI-Util/Util.pm at master · perlancar/perl-Color-ANSI-Util
用 Rakefile 管理工程 - 九天雁翎的博客 - 博客频道 - CSDN.NET @
似乎比 makefile 强大。

官方说明有如下优点:
- Ruby 语法
- 可以设定 task 的依赖
- 支持 patterns 的规则
- 灵活的 FileList 类, 行为像 array, 但是可以方便的操作文件名和路径
- 有一个预先包装好的库, 可以方便的实现类似 build tarball 和发布到 ssh 网站等功能.
- 支持并行 task.
```
file "helloworld" => "helloworld.cc" do |t|
    sh "g++ #{t.prerequisites.join(' ')} -o #{t.name}"
end
```
```
task :default => "helloworld"

file "helloworld" => "helloworld.cc" do |t|
    sh "g++ #{t.prerequisites.join(' ')} -o #{t.name}"
end
```
ppresume/quotes: Some random quotes used by http://ppresume.com @
- content:
  - “When you don’t create things, you become defined by your tastes rather than ability. Your tastes only narrow & exclude people. So create.” author: why the luck stuff from: http://whymirror.github.io/
- content:
  - In theory, there is no difference between theory and practice. But, in practice, there is. author: Jan L. A. van de Snepscheut from: Wikipedia
- content:
  - The future has already arrived. It is just not evenly distributed yet. author: William Gibson from: Wikiquote
- content:
  - The term kerning also takes on a different meaning. In digital typesetting, kerning is a second advance vector that is added to the first. author: Yannis Haralambous from: Fonts and Encodings

mislav/poignant-guide: Why’s Poignant Guide to Ruby @

On August 19, 2009 Why the Lucky Stiff removed every trace of his work from the Web, including this book: the Poignant Guide to Ruby.

poignant, ['pɔɪnjənt], adj. 尖锐的；辛酸的；深刻的；切中要害的

I’ve salvaged （拯救） the book from the Internet archive and re-published it. The original work was under the Attribution-ShareAlike license.

“Quite so,” he said. “I went out to my car yesterday and there was a shoe in the passenger’s seat. A very battered (磨损的) oxford. Looking straight ahead like it needed a lift to the cobbler’s (补鞋匠). I did a cavity search and came up with a crisp note from my deceased (已故的) ancestor, the same whose property I’ve looked after, lo, these many years.”

“Wow,” I said. And I glared at my shoe, at the things it would do when I’m gone.

  ~ the potion pledge ~

    EVERYTHING IS AN OBJECT.
    However, OBJECTS AREN'T EVERYTHING.

    (And, incidentally, everything is a function.)

  * Elimination of line noise.

    I avoid @, #, $, %, {}.
    Stick with ., |, (), [], =, !, ?. Easier on the eyes.
    These are common punctuations in English.

  * I try to defer to （defer to，遵从）English when it comes to punctuation rules.

    Period means "end". (In other langs it means "method call".)
    Comma breaks up statements.
    Space between messages gives a noun-verb feeling.

      window open (width=400, height=500)

  ~ feverish （极度兴奋的） and fond thankyous ~

  I am gravely indebted to Basile Starynkevitch, who fielded my
  questions about his garbage collector. I favor French hackers
  to an extreme (Xavier Leroy, Nicolas Cannasse, Guy Decoux,
  Mathieu Bochard to name only a portion of those I admire) and
  am very glad to represent their influence in Potion's garbage
  collector.

refs and see also

why’s (poignant) Guide to Ruby - Wikipedia @

The book is published in HTML and PDF. Chapter three was reprinted in The Best Software Writing I: Selected and Introduced by Joel Spolsky (Apress, 2005).
我的屁神男友 @

檀郎的屁总是很臭，臭满整个被窝。平日里，我是个比较能作的人，而他有比较傻逼，所以我经常和他闹别扭。闹起别扭来，我喜欢把头埋进被子里，可他的屁实在是太臭了，弄得我狼狈地掀开被子，提起来一通狂扇。倘若我没在被窝里，他就很乖巧地掀开被子，将屁股稍微伸出去一点再放。发现他这个动作，我必须迅速躲开，才能不被熏死，促狭心起的时候，他就一把搂着我不放，非要我闻上一闻才罢休。好在很小的时候，我就练成了一门绝世武功，迅速翻起上嘴唇将鼻孔紧紧堵住。这门武功需要强大的鼻息，将上嘴唇深深吸住才行。
Ruby, Ruby on Rails, and _why: The disappearance of one of the world’s most beloved computer programmers. @

He riffed on his nom d’Internet, Why the Lucky Stiff: “Some people want to call me Mr. Why. My nametag was filed under ‘L.’ The thing is, it’s just a middle name. There’s no first or last. It’s just one middle name. That’s just the nature of it,” he said.
It’s All Text! :: Add-ons for Firefox @

把编辑快捷键绑定到 c-m 上比较爽。没有冲突。m->markdown。调用 vim 是最好的。以前我用过一个 Edit with Emacs。似乎一模一样。
如何评价某上海女生对快餐店服务员说「在上海做服务业要会说上海话」的热门微博？ - 钱卓群的回答 - 知乎 @

而在这样的背景下，这个语言本身在这些身份歧视者人群体中地位会高涨，而在外部人群看来，则会被鄙视，去学的人，无论出于什么目的，都显得有点钻营而谄媚（黑人也中有因 acting white 的原因被鄙视的状况）。这个环境是不利于语言扩散发展的。并且在这样的背景下，任何讨论都是对圈外人的冒犯，进而强化 B 答案，真正纯正目的想保护发展某语言，应该是压制这种言论和相关的讨论才对。
在线阅读 PDF 和做笔记的网站有吗？ - 在线阅读 - 知乎 @
refs and see also
Fonts & Encodings - O’Reilly Media

Vim @

:digraphs

输入方法 C-k @

CTRL-K a:               " ä
CTRL-K e>               " ê

By decimal value: ^Vnnn (with 000 <= nnn <= 255)
By octal value: ^VOnnn or ^Vonnn (with 000 <= nnn <= 377)
By hex value: ^VXnn or ^Vxnn (with 00 <= nn <= FF)
By hex value for BMP Unicode codepoints: ^Vunnnn (with 0000 <= nnnn <= FFFF)
By hex value for any Unicode codepoint: ^VUnnnnnnnn (with 00000000 <= nnnnnnnn <= 7FFFFFFF)

See :help mbyte-combining for details.

See :help digraph-table for details.

规则：

char name                   char                    meaning ~
Exclamation mark            !                       Grave
Apostrophe                  '                       Acute accent
Greater-Than sign           >                       Circumflex accent
Question mark               ?                       Tilde
Hyphen-Minus                -                       Macron
Left parenthesis            (                       Breve
Full stop                   .                       Dot above
Colon                       :                       Diaeresis
Comma                       ,                       Cedilla
Underline                   _                       Underline
Solidus                     /                       Stroke
Quotation mark              "                       Double acute accent
Semicolon                   ;                       Ogonek
Less-Than sign              <                       Caron
Zero                        0                       Ring above
Two                         2                       Hook
Nine                        9                       Horn
Equals                      =                       Cyrillic (= used as second char)
Asterisk                    *                       Greek
Percent sign                %                       Greek/Cyrillic special
Plus                        +                       smalls: Arabic, capitals: Hebrew
Three                       3                       some Latin/Greek/Cyrillic letters
Four                        4                       Bopomofo
Five                        5                       Hiragana
Six                         6                       Katakana

声调 !'><?:-;: @

À   A!  0xc0    192     LATIN CAPITAL LETTER A WITH GRAVE
Á   A'  0xc1    193     LATIN CAPITAL LETTER A WITH ACUTE
Â   A>  0xc2    194     LATIN CAPITAL LETTER A WITH CIRCUMFLEX
Ǎ   A<
Ã   A?  0xc3    195     LATIN CAPITAL LETTER A WITH TILDE
Ä   A:  0xc4    196     LATIN CAPITAL LETTER A WITH DIAERESIS
Ā   A-  0100    0256    LATIN CAPITAL LETTER A WITH MACRON
Ą   A;  0104    0260    LATIN CAPITAL LETTER A WITH OGONEK
Ä   A:
Å   AA  0xc5    197     LATIN CAPITAL LETTER A WITH RING ABOVE

（不是每个字母都有声调。）

货币 @

¤   Cu  0xa4    164     CURRENCY SIGN
¥   Ye  0xa5    165     YEN SIGN
€   Eu  20AC    8364    EURO SIGN
£   Pd  0xa3    163     POUND SIGN
‰   %0  2030    8240    PER MILLE SIGN
℃   oC  2103    8451    DEGREE CELSIUS
℉   oF  2109    8457    DEGREE FAHRENHEIT
Ω   Om  2126    8486    OHM SIGN    （电阻：欧姆）

字母表 希腊“星”，拉丁“形” @

规则：

希腊字符（alpha~omega）都是 [大写字母/小写字母]*

希腊字符：

Α   A*  0391    0913    GREEK CAPITAL LETTER ALPHA
Β   B*  0392    0914    GREEK CAPITAL LETTER BETA
Γ   G*  0393    0915    GREEK CAPITAL LETTER GAMMA
Δ   D*  0394    0916    GREEK CAPITAL LETTER DELTA
Ε   E*  0395    0917    GREEK CAPITAL LETTER EPSILON
Ζ   Z*  0396    0918    GREEK CAPITAL LETTER ZETA
Η   Y*  0397    0919    GREEK CAPITAL LETTER ETA
Θ   H*  0398    0920    GREEK CAPITAL LETTER THETA
Ι   I*  0399    0921    GREEK CAPITAL LETTER IOTA
Κ   K*  039A    0922    GREEK CAPITAL LETTER KAPPA
Λ   L*  039B    0923    GREEK CAPITAL LETTER LAMDA
Μ   M*  039C    0924    GREEK CAPITAL LETTER MU
Ν   N*  039D    0925    GREEK CAPITAL LETTER NU
Ξ   C*  039E    0926    GREEK CAPITAL LETTER XI
Ο   O*  039F    0927    GREEK CAPITAL LETTER OMICRON
Π   P*  03A0    0928    GREEK CAPITAL LETTER PI
Ρ   R*  03A1    0929    GREEK CAPITAL LETTER RHO
Σ   S*  03A3    0931    GREEK CAPITAL LETTER SIGMA
Τ   T*  03A4    0932    GREEK CAPITAL LETTER TAU
Υ   U*  03A5    0933    GREEK CAPITAL LETTER UPSILON
Φ   F*  03A6    0934    GREEK CAPITAL LETTER PHI
Χ   X*  03A7    0935    GREEK CAPITAL LETTER CHI
Ψ   Q*  03A8    0936    GREEK CAPITAL LETTER PSI
Ω   W*  03A9    0937    GREEK CAPITAL LETTER OMEGA

α   a*  03B1    0945    GREEK SMALL LETTER ALPHA
β   b*  03B2    0946    GREEK SMALL LETTER BETA
γ   g*  03B3    0947    GREEK SMALL LETTER GAMMA
δ   d*  03B4    0948    GREEK SMALL LETTER DELTA
ε   e*  03B5    0949    GREEK SMALL LETTER EPSILON
ζ   z*  03B6    0950    GREEK SMALL LETTER ZETA
η   y*  03B7    0951    GREEK SMALL LETTER ETA
θ   h*  03B8    0952    GREEK SMALL LETTER THETA
ι   i*  03B9    0953    GREEK SMALL LETTER IOTA
κ   k*  03BA    0954    GREEK SMALL LETTER KAPPA
λ   l*  03BB    0955    GREEK SMALL LETTER LAMDA
μ   m*  03BC    0956    GREEK SMALL LETTER MU
ν   n*  03BD    0957    GREEK SMALL LETTER NU
ξ   c*  03BE    0958    GREEK SMALL LETTER XI
ο   o*  03BF    0959    GREEK SMALL LETTER OMICRON
π   p*  03C0    0960    GREEK SMALL LETTER PI
ρ   r*  03C1    0961    GREEK SMALL LETTER RHO
ς   *s  03C2    0962    GREEK SMALL LETTER FINAL SIGMA
σ   s*  03C3    0963    GREEK SMALL LETTER SIGMA
τ   t*  03C4    0964    GREEK SMALL LETTER TAU
υ   u*  03C5    0965    GREEK SMALL LETTER UPSILON
φ   f*  03C6    0966    GREEK SMALL LETTER PHI
χ   x*  03C7    0967    GREEK SMALL LETTER CHI
ψ   q*  03C8    0968    GREEK SMALL LETTER PSI
ω   w*  03C9    0969    GREEK SMALL LETTER OMEGA

这些也是希腊字符：

ϊ   j*  03CA    0970    GREEK SMALL LETTER IOTA WITH DIALYTIKA
Ϊ   J*  03AA    0938    GREEK CAPITAL LETTER IOTA WITH DIALYTIKA

ύ   u%  03CD    0973    GREEK SMALL LETTER UPSILON WITH TONOS
ϋ   v*  03CB    0971    GREEK SMALL LETTER UPSILON WITH DIALYTIKA
Ϋ   V*  03AB    0939    GREEK CAPITAL LETTER UPSILON WITH DIALYTIKA

ό   o%  03CC    0972    GREEK SMALL LETTER OMICRON WITH TONOS
ώ   w%  03CE    0974    GREEK SMALL LETTER OMEGA WITH TONOS

ά   a%  03AC    0940    GREEK SMALL LETTER ALPHA WITH TONOS
έ   e%  03AD    0941    GREEK SMALL LETTER EPSILON WITH TONOS
ή   y%  03AE    0942    GREEK SMALL LETTER ETA WITH TONOS
ί   i%  03AF    0943    GREEK SMALL LETTER IOTA WITH TONOS

ΰ   u3  03B0    0944    GREEK SMALL LETTER UPSILON WITH DIALYTIKA AND TONOS

Ϙ   'G  03D8    0984    GREEK LETTER ARCHAIC KOPPA
ϙ   ,G  03D9    0985    GREEK SMALL LETTER ARCHAIC KOPPA
Ϛ   T3  03DA    0986    GREEK LETTER STIGMA
ϛ   t3  03DB    0987    GREEK SMALL LETTER STIGMA
Ϝ   M3  03DC    0988    GREEK LETTER DIGAMMA
ϝ   m3  03DD    0989    GREEK SMALL LETTER DIGAMMA
Ϟ   K3  03DE    0990    GREEK LETTER KOPPA
ϟ   k3  03DF    0991    GREEK SMALL LETTER KOPPA
Ϡ   P3  03E0    0992    GREEK LETTER SAMPI
ϡ   p3  03E1    0993    GREEK SMALL LETTER SAMPI
ϴ   '%  03F4    1012    GREEK CAPITAL THETA SYMBOL
ϵ   j3  03F5    1013    GREEK LUNATE EPSILON SYMBOL

拉丁字符

Ø   O/  0xd8    216     LATIN CAPITAL LETTER O WITH STROKE
ß   ss  0xdf    223     LATIN SMALL LETTER SHARP S (German)
æ   ae  0xe6    230     LATIN SMALL LETTER AE
ç   c,  0xe7    231     LATIN SMALL LETTER C WITH CEDILLA
ð   d-  0xf0    240     LATIN SMALL LETTER ETH (Icelandic)
÷   -:  0xf7    247     DIVISION SIGN
ø   o/  0xf8    248     LATIN SMALL LETTER O WITH STROKE
Ċ   C.  010A    0266    LATIN CAPITAL LETTER C WITH DOT ABOVE
đ   d/  0111    0273    LATIN SMALL LETTER D WITH STROKE
Ĥ   H>  0124    0292    LATIN CAPITAL LETTER H WITH CIRCUMFLEX
ĥ   h>  0125    0293    LATIN SMALL LETTER H WITH CIRCUMFLEX
ħ   h/  0127    0295    LATIN SMALL LETTER H WITH STROKE
ĳ   ij  0133    0307    LATIN SMALL LIGATURE IJ
Œ   OE  0152    0338    LATIN CAPITAL LIGATURE OE
œ   oe  0153    0339    LATIN SMALL LIGATURE OE
ŋ   ng  014B    0331    LATIN SMALL LETTER ENG
Ƶ   Z/  01B5    0437    LATIN CAPITAL LETTER Z WITH STROKE
ƶ   z/  01B6    0438    LATIN SMALL LETTER Z WITH STROKE
Ʒ   ED  01B7    0439    LATIN CAPITAL LETTER EZH

Ezh (Ʒ ʒ) /ˈɛʒ/, also called the “tailed z”, is a letter whose lower case form is used in the International Phonetic Alphabet (IPA), representing the voiced postalveolar fricative consonant. For example: vision /ˈvɪʒən/.

refs and see also

Ezh - Wikipedia

空格和连字符 @

    1N  2002    8194    EN SPACE
    1M  2003    8195    EM SPACE
    3M  2004    8196    THREE-PER-EM SPACE
    4M  2005    8197    FOUR-PER-EM SPACE
    6M  2006    8198    SIX-PER-EM SPACE
    1T  2009    8201    THIN SPACE
    1H  200A    8202    HAIR SPACE

‐   -1  2010    8208    HYPHEN
–   -N  2013    8211    EN DASH `
—   -M  2014    8212    EM DASH
―   -3  2015    8213    HORIZONTAL BAR

上下标与数字 S/s/R/r/c @

各种 prime 的格式是 [1-3] + ' 或者 "

′   1'  2032    8242    PRIME
″   2'  2033    8243    DOUBLE PRIME
‴   3'  2034    8244    TRIPLE PRIME
‵   1"  2035    8245    REVERSED PRIME
‶   2"  2036    8246    REVERSED DOUBLE PRIME
‷   3"  2037    8247    REVERSED TRIPLE PRIME

上标是 [0~9+-=]S（superscript）：

⁰   0S  2070    8304    SUPERSCRIPT ZERO
¹   1S  0xb9    185     SUPERSCRIPT ONE
²   2S  0xb2    178     SUPERSCRIPT TWO
³   3S  0xb3    179     SUPERSCRIPT THREE
⁴   4S  2074    8308    SUPERSCRIPT FOUR
⁵   5S  2075    8309    SUPERSCRIPT FIVE
⁶   6S  2076    8310    SUPERSCRIPT SIX
⁷   7S  2077    8311    SUPERSCRIPT SEVEN
⁸   8S  2078    8312    SUPERSCRIPT EIGHT
⁹   9S  2079    8313    SUPERSCRIPT NINE
⁺   +S  207A    8314    SUPERSCRIPT PLUS SIGN
⁻   -S  207B    8315    SUPERSCRIPT MINUS
⁼   =S  207C    8316    SUPERSCRIPT EQUALS SIGN
⁽   (S  207D    8317    SUPERSCRIPT LEFT PARENTHESIS
⁾   )S  207E    8318    SUPERSCRIPT RIGHT PARENTHESIS
ⁿ   nS  207F    8319    SUPERSCRIPT LATIN SMALL LETTER N `

举个例子：x²+y²=z² & a⁽⁵⁺⁸⁾

下标是 [0~9+-=]s（subscript）：

₀   0s  2080    8320    SUBSCRIPT ZERO
₁   1s  2081    8321    SUBSCRIPT ONE
₂   2s  2082    8322    SUBSCRIPT TWO
₃   3s  2083    8323    SUBSCRIPT THREE
₄   4s  2084    8324    SUBSCRIPT FOUR
₅   5s  2085    8325    SUBSCRIPT FIVE
₆   6s  2086    8326    SUBSCRIPT SIX
₇   7s  2087    8327    SUBSCRIPT SEVEN
₈   8s  2088    8328    SUBSCRIPT EIGHT
₉   9s  2089    8329    SUBSCRIPT NINE
₊   +s  208A    8330    SUBSCRIPT PLUS SIGN
₋   -s  208B    8331    SUBSCRIPT MINUS
₌   =s  208C    8332    SUBSCRIPT EQUALS SIGN
₍   (s  208D    8333    SUBSCRIPT LEFT PARENTHESIS
₎   )s  208E    8334    SUBSCRIPT RIGHT PARENTHESIS

分数就是两个个数字：

½   12  0xbd    189     VULGAR FRACTION ONE HALF
⅓   13  2153    8531    VULGAR FRACTION ONE THIRD
⅔   23  2154    8532    VULGAR FRACTION TWO THIRDS
¼   14  0xbc    188     VULGAR FRACTION ONE QUARTER
¾   34  0xbe    190     VULGAR FRACTION THREE QUARTERS
⅕   15  2155    8533    VULGAR FRACTION ONE FIFTH
⅖   25  2156    8534    VULGAR FRACTION TWO FIFTHS
⅗   35  2157    8535    VULGAR FRACTION THREE FIFTHS
⅘   45  2158    8536    VULGAR FRACTION FOUR FIFTHS
⅙   16  2159    8537    VULGAR FRACTION ONE SIXTH
⅚   56  215A    8538    VULGAR FRACTION FIVE SIXTHS
⅛   18  215B    8539    VULGAR FRACTION ONE EIGHTH
⅜   38  215C    8540    VULGAR FRACTION THREE EIGHTHS
⅝   58  215D    8541    VULGAR FRACTION FIVE EIGHTHS
⅞   78  215E    8542    VULGAR FRACTION SEVEN EIGHTHS

引用符号是象形（‘ 和 6，’ 和 9）：

˚   '0  02DA    0730    RING ABOVE
‘   '6  2018    8216    LEFT SINGLE QUOTATION MARK
’   '9  2019    8217    RIGHT SINGLE QUOTATION MARK
“   "6  201C    8220    LEFT DOUBLE QUOTATION MARK
”   "9  201D    8221    RIGHT DOUBLE QUOTATION MARK

不过我们的中文输入法已经有这些了。

[1-c]R/r -> 罗马字符 1~12：

Ⅰ   1R  2160    8544    ROMAN NUMERAL ONE
Ⅱ   2R  2161    8545    ROMAN NUMERAL TWO
Ⅲ   3R  2162    8546    ROMAN NUMERAL THREE
Ⅳ   4R  2163    8547    ROMAN NUMERAL FOUR
Ⅴ   5R  2164    8548    ROMAN NUMERAL FIVE
Ⅵ   6R  2165    8549    ROMAN NUMERAL SIX
Ⅶ   7R  2166    8550    ROMAN NUMERAL SEVEN
Ⅷ   8R  2167    8551    ROMAN NUMERAL EIGHT
Ⅸ   9R  2168    8552    ROMAN NUMERAL NINE
Ⅹ   aR  2169    8553    ROMAN NUMERAL TEN
Ⅺ   bR  216A    8554    ROMAN NUMERAL ELEVEN
Ⅻ   cR  216B    8555    ROMAN NUMERAL TWELVE

ⅰ   1r  2170    8560    SMALL ROMAN NUMERAL ONE
ⅱ   2r  2171    8561    SMALL ROMAN NUMERAL TWO
ⅲ   3r  2172    8562    SMALL ROMAN NUMERAL THREE
ⅳ   4r  2173    8563    SMALL ROMAN NUMERAL FOUR
ⅴ   5r  2174    8564    SMALL ROMAN NUMERAL FIVE
ⅵ   6r  2175    8565    SMALL ROMAN NUMERAL SIX
ⅶ   7r  2176    8566    SMALL ROMAN NUMERAL SEVEN
ⅷ   8r  2177    8567    SMALL ROMAN NUMERAL EIGHT
ⅸ   9r  2178    8568    SMALL ROMAN NUMERAL NINE
ⅹ   ar  2179    8569    SMALL ROMAN NUMERAL TEN
ⅺ   br  217A    8570    SMALL ROMAN NUMERAL ELEVEN
ⅻ   cr  217B    8571    SMALL ROMAN NUMERAL TWELVE

[1-9]c -> 汉字（ideogram，象形，表意，['ɪdiə.ɡræm]）：

㈠  1c  3220    12832   PARENTHESIZED IDEOGRAPH ONE
㈡  2c  3221    12833   PARENTHESIZED IDEOGRAPH TWO
㈢  3c  3222    12834   PARENTHESIZED IDEOGRAPH THREE
㈣  4c  3223    12835   PARENTHESIZED IDEOGRAPH FOUR
㈤  5c  3224    12836   PARENTHESIZED IDEOGRAPH FIVE
㈥  6c  3225    12837   PARENTHESIZED IDEOGRAPH SIX
㈦  7c  3226    12838   PARENTHESIZED IDEOGRAPH SEVEN
㈧  8c  3227    12839   PARENTHESIZED IDEOGRAPH EIGHT
㈨  9c  3228    12840   PARENTHESIZED IDEOGRAPH NINE

你可以把 c 理解成 chinese。

数字加上 . 就是数字编号（这个已经不能更加直接了……）：

⒈   1.  2488    9352    DIGIT ONE FULL STOP
⒉   2.  2489    9353    DIGIT TWO FULL STOP
⒊   3.  248A    9354    DIGIT THREE FULL STOP
⒋   4.  248B    9355    DIGIT FOUR FULL STOP
⒌   5.  248C    9356    DIGIT FIVE FULL STOP
⒍   6.  248D    9357    DIGIT SIX FULL STOP
⒎   7.  248E    9358    DIGIT SEVEN FULL STOP
⒏   8.  248F    9359    DIGIT EIGHT FULL STOP
⒐   9.  2490    9360    DIGIT NINE FULL STOP

逻辑符号以及各种箭头 ♥️ @

逻辑符号：

∵   :.  2235    8757    BECAUSE         从上往下看，先看到的就是 :，后看到的就是 .
∴   .:  2234    8756    THEREFORE

∀   FA  2200    8704    FOR ALL
∃   TE  2203    8707    THERE EXISTS

这个 DE 和 NB 不好记，但是是很有用的字符。
∆   DE  2206    8710    INCREMENT
∇   NB  2207    8711    NABLA

∧   AN  2227    8743    LOGICAL AND
∨   OR  2228    8744    LOGICAL OR

∅   /0  2205    8709    EMPTY SET
∈   (-  2208    8712    ELEMENT OF
∋   -)  220B    8715    CONTAINS AS MEMBER
∝   0(  221D    8733    PROPORTIONAL TO
∩   (U  2229    8745    INTERSECTION
∪   )U  222A    8746    UNION
⊂   (C  2282    8834    SUBSET OF
⊃   )C  2283    8835    SUPERSET OF
⊆   (_  2286    8838    SUBSET OF OR EQUAL TO
⊇   )_  2287    8839    SUPERSET OF OR EQUAL TO

≡   =3  2261    8801    IDENTICAL TO
⇔   ==  21D4    8660    LEFT RIGHT DOUBLE ARROW
≠   !=  2260    8800    NOT EQUAL TO
≤   =<  2264    8804    LESS-THAN OR EQUAL TO       这两个这么怪，是因为 => 和 <= 用做了箭头
≥   >=  2265    8805    GREATER-THAN OR EQUAL TO
≮   !<  226E    8814    NOT LESS-THAN
≯   !>  226F    8815    NOT GREATER-THAN
≪   <*  226A    8810    MUCH LESS-THAN
≫   *>  226B    8811    MUCH GREATER-THAN

≃   ?-  2243    8771    ASYMPTOTICALLY EQUAL TO
≅   ?=  2245    8773    APPROXIMATELY EQUAL TO
≈   ?2  2248    8776    ALMOST EQUAL TO
≌   =?  224C    8780    ALL EQUAL TO

‖   !2  2016    8214    DOUBLE VERTICAL LINE
‗   =2  2017    8215    DOUBLE LOW LINE

†   /-  2020    8224    DAGGER
‡   /=  2021    8225    DOUBLE DAGGER
±   +-  0xb1    177     PLUS-MINUS SIGN
×   *X  0xd7    215     MULTIPLICATION SIGN
⁄   /f  2044    8260    FRACTION SLASH
※   :X  203B    8251    REFERENCE MARK

∏   *P  220F    8719    N-ARY PRODUCT
∑   +Z  2211    8721    N-ARY SUMMATION
∓   -+  2213    8723    MINUS-OR-PLUS SIGN

Integral，一种是 In，一种是 DI，一种是环 Io
∫   In  222B    8747    INTEGRAL
∬   DI  222C    8748    DOUBLE INTEGRAL
∮   Io  222E    8750    CONTOUR INTEGRAL

⊙   0.  2299    8857    CIRCLED DOT OPERATOR
⊥   -T  22A5    8869    UP TACK
⋅   .P  22C5    8901    DOT OPERATOR
⋮   :3  22EE    8942    VERTICAL ELLIPSIS
⋯   .3  22EF    8943    MIDLINE HORIZONTAL ELLIPSIS

⌈   <7  2308    8968    LEFT CEILING
⌉   >7  2309    8969    RIGHT CEILING
⌊   7<  230A    8970    LEFT FLOOR
⌋   7>  230B    8971    RIGHT FLOOR

〈  </  2329    9001    LEFT-POINTING ANGLE BRACKET
〉  />  232A    9002    RIGHT-POINTING ANGLE BRACKET

各种箭头：

←   <-  2190    8592    LEFTWARDS ARROW
↑   -!  2191    8593    UPWARDS ARROW
→   ->  2192    8594    RIGHTWARDS ARROW
↓   -v  2193    8595    DOWNWARDS ARROW
↔   <>  2194    8596    LEFT RIGHT ARROW
↕   UD  2195    8597    UP DOWN ARROW
⇐   <=  21D0    8656    LEFTWARDS DOUBLE ARROW
⇒   =>  21D2    8658    RIGHTWARDS DOUBLE ARROW

看上去是箭头，但其实是引用符号：
‹   <1  2039    8249    SINGLE LEFT-POINTING ANGLE QUOTATION MARK
›   >1  203A    8250    SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
«   <<  0xab    171     LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
»   >>  0xbb    187     RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK

其他 @

对错
✓   OK  2713    10003   CHECK MARK
✗   XX  2717    10007   BALLOT X

性别
♀   Fm  2640    9792    FEMALE SIGN
♂   Ml  2642    9794    MALE SIGN

牌（Suit (cards)）
    The four French playing cards suits used primarily in the
    English-speaking world:
        spades (♠),
        hearts (♥),
        diamonds (♦) and
        clubs (♣)
♠   cS  2660    9824    BLACK SPADE SUIT
♡   cH  2661    9825    WHITE HEART SUIT
♢   cD  2662    9826    WHITE DIAMOND SUIT
♣   cC  2663    9827    BLACK CLUB SUIT

音符
♩   Md  2669    9833    QUARTER NOTE `
♪   M8  266A    9834    EIGHTH NOTE `
♫   M2  266B    9835    BEAMED EIGHTH NOTES
♭   Mb  266D    9837    MUSIC FLAT SIGN
♮   Mx  266E    9838    MUSIC NATURAL SIGN
♯   MX  266F    9839    MUSIC SHARP SIGN

注音
ㄅ  b4  3105    12549   BOPOMOFO LETTER B
ㄆ  p4  3106    12550   BOPOMOFO LETTER P
ㄇ  m4  3107    12551   BOPOMOFO LETTER M
ㄈ  f4  3108    12552   BOPOMOFO LETTER F
ㄉ  d4  3109    12553   BOPOMOFO LETTER D
ㄊ  t4  310A    12554   BOPOMOFO LETTER T
ㄋ  n4  310B    12555   BOPOMOFO LETTER N `
ㄌ  l4  310C    12556   BOPOMOFO LETTER L
ㄍ  g4  310D    12557   BOPOMOFO LETTER G
ㄎ  k4  310E    12558   BOPOMOFO LETTER K
ㄏ  h4  310F    12559   BOPOMOFO LETTER H
ㄐ  j4  3110    12560   BOPOMOFO LETTER J
ㄑ  q4  3111    12561   BOPOMOFO LETTER Q
ㄒ  x4  3112    12562   BOPOMOFO LETTER X
ㄓ  zh  3113    12563   BOPOMOFO LETTER ZH
ㄔ  ch  3114    12564   BOPOMOFO LETTER CH
ㄕ  sh  3115    12565   BOPOMOFO LETTER SH
ㄖ  r4  3116    12566   BOPOMOFO LETTER R
ㄗ  z4  3117    12567   BOPOMOFO LETTER Z
ㄘ  c4  3118    12568   BOPOMOFO LETTER C
ㄙ  s4  3119    12569   BOPOMOFO LETTER S
ㄚ  a4  311A    12570   BOPOMOFO LETTER A
ㄛ  o4  311B    12571   BOPOMOFO LETTER O
ㄜ  e4  311C    12572   BOPOMOFO LETTER E
ㄞ  ai  311E    12574   BOPOMOFO LETTER AI
ㄟ  ei  311F    12575   BOPOMOFO LETTER EI
ㄠ  au  3120    12576   BOPOMOFO LETTER AU
ㄡ  ou  3121    12577   BOPOMOFO LETTER OU
ㄢ  an  3122    12578   BOPOMOFO LETTER AN
ㄣ  en  3123    12579   BOPOMOFO LETTER EN
ㄤ  aN  3124    12580   BOPOMOFO LETTER ANG
ㄥ  eN  3125    12581   BOPOMOFO LETTER ENG
ㄦ  er  3126    12582   BOPOMOFO LETTER ER
ㄧ  i4  3127    12583   BOPOMOFO LETTER I
ㄨ  u4  3128    12584   BOPOMOFO LETTER U
ㄩ  iu  3129    12585   BOPOMOFO LETTER IU
ㄪ  v4  312A    12586   BOPOMOFO LETTER V
ㄫ  nG  312B    12587   BOPOMOFO LETTER NG
ㄬ  gn  312C    12588   BOPOMOFO LETTER GN

ligature：

ﬀ   ff  FB00    64256   LATIN SMALL LIGATURE FF
ﬁ   fi  FB01    64257   LATIN SMALL LIGATURE FI
ﬂ   fl  FB02    64258   LATIN SMALL LIGATURE FL
ﬅ   ft  FB05    64261   LATIN SMALL LIGATURE LONG S T
ﬆ   st  FB06    64262   LATIN SMALL LIGATURE ST

°   DG  0xb0    176 DEGREE SIGN
§   SE  0xa7    167 SECTION SIGN
¶   PI  0xb6    182 PILCROW SIGN
¦   BB  0xa6    166 BROKEN BAR
·   .M  0xb7    183 MIDDLE DOT
¨   ':  0xa8    168 DIAERESIS
©   Co  0xa9    169 COPYRIGHT SIGN
¬   NO  0xac    172 NOT SIGN
®   Rg  0xae    174 REGISTERED SIGN
µ   My  0xb5    181 MICRO SIGN      这是“微”不是 mu
¿   ?I  0xbf    191 INVERTED QUESTION MARK
∞   00  221E    8734    INFINITY
∂   dP  2202    8706    PARTIAL DIFFERENTIAL
∘   Ob  2218    8728    RING OPERATOR
∙   Sb  2219    8729    BULLET OPERATOR
√   RT  221A    8730    SQUARE ROOT
∠   -V  2220    8736    ANGLE
∥   PP  2225    8741    PARALLEL TO