2 U+0020 <-- all space characters (general category Zs)
3 U+0027 ' <-- left/right single quotation mark U+2018..2019,
4 modifier letter apostrophe U+02BC,
5 modifier letter vertical line U+02C8
6 U+002D - <-- all dash characters (general category Pd),
8 U+002F / <-- fraction slash U+2044,
10 U+003A : <-- ratio U+2236
11 U+003C < <-- single left-pointing angle quotation mark U+2039,
12 left-pointing angle bracket U+2329,
13 left angle bracket U+3008
14 U+003E > <-- single right-pointing angle quotation mark U+203A,
15 right-pointing angle bracket U+232A,
16 right angle bracket U+3009
17 U+005C \ <-- set minus U+2216
18 U+005E ^ <-- modifier letter up arrowhead U+02C4,
19 modifier letter circumflex accent U+02C6,
22 U+005F _ <-- all connector characters (general category Pc),
23 modifier letter low macron U+02CD
24 U+0060 ` <-- modifier letter grave accent U+02CB
25 U+007C | <-- divides U+2223
26 U+007E ~ <-- tilde operator U+223C