很好的问题!
答案是数学字母。去年12月,我对整个PubMed Open Access语料库进行了扫描,并提出了其中的星形字符的这些数字。
下图中的第一个数字是我在整个语料库中发现的每个给定代码点的副本数。不过,首先要给您一个相对频率的概念,这是该语料库中排名前十的trans-ASCII代码点:
2663710 U+002013 ‹–› GC=Pd EN DASH
1065594 U+0000A0 ‹ › GC=Zs NO-BREAK SPACE
1009762 U+0000B1 ‹±› GC=Sm PLUS-MINUS SIGN
784139 U+002212 ‹−› GC=Sm MINUS SIGN
602377 U+002003 ‹ › GC=Zs EM SPACE
528576 U+0003BC ‹μ› GC=Ll GREEK SMALL LETTER MU
519669 U+0003B2 ‹β› GC=Ll GREEK SMALL LETTER BETA
512312 U+0003B1 ‹α› GC=Ll GREEK SMALL LETTER ALPHA
491842 U+00200A ‹ › GC=Zs HAIR SPACE
462505 U+0000B0 ‹°› GC=So DEGREE SIGN
现在是按降序排列的trans-BMP代码点:
544 U+01D49E ‹𝒞› GC=Lu MATHEMATICAL SCRIPT CAPITAL C
450 U+01D4AF ‹𝒯› GC=Lu MATHEMATICAL SCRIPT CAPITAL T
385 U+01D4AE ‹𝒮› GC=Lu MATHEMATICAL SCRIPT CAPITAL S
292 U+01D49F ‹𝒟› GC=Lu MATHEMATICAL SCRIPT CAPITAL D
285 U+01D4B3 ‹𝒳› GC=Lu MATHEMATICAL SCRIPT CAPITAL X
262 U+01D4A9 ‹𝒩› GC=Lu MATHEMATICAL SCRIPT CAPITAL N
258 U+01D4AB ‹𝒫› GC=Lu MATHEMATICAL SCRIPT CAPITAL P
254 U+01D4A2 ‹𝒢› GC=Lu MATHEMATICAL SCRIPT CAPITAL G
185 U+01D49C ‹𝒜› GC=Lu MATHEMATICAL SCRIPT CAPITAL A
178 U+01D53C ‹𝔼› GC=Lu MATHEMATICAL DOUBLE-STRUCK CAPITAL E
137 U+01D4AA ‹𝒪› GC=Lu MATHEMATICAL SCRIPT CAPITAL O
56 U+01D4A5 ‹𝒥› GC=Lu MATHEMATICAL SCRIPT CAPITAL J
48 U+01D4A6 ‹𝒦› GC=Lu MATHEMATICAL SCRIPT CAPITAL K
44 U+01D4B1 ‹𝒱› GC=Lu MATHEMATICAL SCRIPT CAPITAL V
43 U+01D4B2 ‹𝒲› GC=Lu MATHEMATICAL SCRIPT CAPITAL W
42 U+01D4B4 ‹𝒴› GC=Lu MATHEMATICAL SCRIPT CAPITAL Y
41 U+01D4B5 ‹𝒵› GC=Lu MATHEMATICAL SCRIPT CAPITAL Z
35 U+01D4B0 ‹𝒰› GC=Lu MATHEMATICAL SCRIPT CAPITAL U
30 U+01D4AC ‹𝒬› GC=Lu MATHEMATICAL SCRIPT CAPITAL Q
23 U+01D54A ‹𝕊› GC=Lu MATHEMATICAL DOUBLE-STRUCK CAPITAL S
21 U+01D539 ‹𝔹› GC=Lu MATHEMATICAL DOUBLE-STRUCK CAPITAL B
19 U+01D5A7 ‹𝖧› GC=Lu MATHEMATICAL SANS-SERIF CAPITAL H
18 U+01D517 ‹𝔗› GC=Lu MATHEMATICAL FRAKTUR CAPITAL T
15 U+01D4C3 ‹𝓃› GC=Ll MATHEMATICAL SCRIPT SMALL N
14 U+01D535 ‹𝔵› GC=Ll MATHEMATICAL FRAKTUR SMALL X
13 U+01D4BF ‹𝒿› GC=Ll MATHEMATICAL SCRIPT SMALL J
11 U+01D540 ‹𝕀› GC=Lu MATHEMATICAL DOUBLE-STRUCK CAPITAL I
9 U+01D465 ‹𝑥› GC=Ll MATHEMATICAL ITALIC SMALL X
9 U+01D4CE ‹𝓎› GC=Ll MATHEMATICAL SCRIPT SMALL Y
9 U+01D538 ‹𝔸› GC=Lu MATHEMATICAL DOUBLE-STRUCK CAPITAL A
8 U+01D4C2 ‹𝓂› GC=Ll MATHEMATICAL SCRIPT SMALL M
8 U+01D54D ‹𝕍› GC=Lu MATHEMATICAL DOUBLE-STRUCK CAPITAL V
7 U+01D4B6 ‹𝒶› GC=Ll MATHEMATICAL SCRIPT SMALL A
7 U+01D4BE ‹𝒾› GC=Ll MATHEMATICAL SCRIPT SMALL I
7 U+01D4CC ‹𝓌› GC=Ll MATHEMATICAL SCRIPT SMALL W
7 U+01D516 ‹𝔖› GC=Lu MATHEMATICAL FRAKTUR CAPITAL S
7 U+01D4BE ‹𝒾› GC=Ll MATHEMATICAL SCRIPT SMALL I
7 U+01D4CC ‹𝓌› GC=Ll MATHEMATICAL SCRIPT SMALL W
7 U+01D516 ‹𝔖› GC=Lu MATHEMATICAL FRAKTUR CAPITAL S
4 U+01D4CF ‹𝓏› GC=Ll MATHEMATICAL SCRIPT SMALL Z
4 U+01D53B ‹𝔻› GC=Lu MATHEMATICAL DOUBLE-STRUCK CAPITAL D
4 U+01D54B ‹𝕋› GC=Lu MATHEMATICAL DOUBLE-STRUCK CAPITAL T
3 U+01D4BB ‹𝒻› GC=Ll MATHEMATICAL SCRIPT SMALL F
3 U+01D4CA ‹𝓊› GC=Ll MATHEMATICAL SCRIPT SMALL U
3 U+01D507 ‹𝔇› GC=Lu MATHEMATICAL FRAKTUR CAPITAL D
3 U+01D542 ‹𝕂› GC=Lu MATHEMATICAL DOUBLE-STRUCK CAPITAL K
3 U+01D546 ‹𝕆› GC=Lu MATHEMATICAL DOUBLE-STRUCK CAPITAL O
2 U+01D4BD ‹𝒽› GC=Ll MATHEMATICAL SCRIPT SMALL H
2 U+01D4C5 ‹𝓅› GC=Ll MATHEMATICAL SCRIPT SMALL P
2 U+01D505 ‹𝔅› GC=Lu MATHEMATICAL FRAKTUR CAPITAL B
2 U+01D50E ‹𝔎› GC=Lu MATHEMATICAL FRAKTUR CAPITAL K
2 U+01D541 ‹𝕁› GC=Lu MATHEMATICAL DOUBLE-STRUCK CAPITAL J
2 U+01D543 ‹𝕃› GC=Lu MATHEMATICAL DOUBLE-STRUCK CAPITAL L
2 U+100002 ‹› GC=Co <private use character>
1 U+01D4B8 ‹𝒸› GC=Ll MATHEMATICAL SCRIPT SMALL C
1 U+01D4C1 ‹𝓁› GC=Ll MATHEMATICAL SCRIPT SMALL L
1 U+01D53D ‹𝔽› GC=Lu MATHEMATICAL DOUBLE-STRUCK CAPITAL F
1 U+01D53E ‹𝔾› GC=Lu MATHEMATICAL DOUBLE-STRUCK CAPITAL G
1 U+01D54C ‹𝕌› GC=Lu MATHEMATICAL DOUBLE-STRUCK CAPITAL U
1 U+01D6A4 ‹𝚤› GC=Ll MATHEMATICAL ITALIC SMALL DOTLESS I
1 U+01D7D9 ‹𝟙› GC=Nd MATHEMATICAL DOUBLE-STRUCK DIGIT ONE
我真的希望我知道他们使用U + 100002做的事情。:(
如果浏览器中未显示这些字体,则应安装George Douros的Symbola font。它还具有所有有趣的Unicode 6.0.0代码点。