U+0020 <-- all space characters (general category Zs)
U+0027 ' <-- left/right single quotation mark U+2018..2019,
modifier letter apostrophe U+02BC,
modifier letter vertical line U+02C8
U+002D - <-- all dash characters (general category Pd),
minus U+2212
U+002F / <-- fraction slash U+2044,
division slash U+2215
U+003A : <-- ratio U+2236
U+003C < <-- single left-pointing angle quotation mark U+2039,
left-pointing angle bracket U+2329,
left angle bracket U+3008
U+003E > <-- single right-pointing angle quotation mark U+203A,
right-pointing angle bracket U+232A,
right angle bracket U+3009
U+005C \ <-- set minus U+2216
U+005E ^ <-- modifier letter up arrowhead U+02C4,
modifier letter circumflex accent U+02C6,
caret U+2038,
up arrowhead U+2303
U+005F _ <-- all connector characters (general category Pc),
modifier letter low macron U+02CD
U+0060 ` <-- modifier letter grave accent U+02CB
U+007C | <-- divides U+2223
U+007E ~ <-- tilde operator U+223C