Special chars

~ = tilde
! = exclamation mark
() = parentheses
- = hyphen, dash
_ = underscore
+ = plus sign
= = equals sign
[] = square brackets
{} = curly brackets (is there something more "official"? braces?)
\ = backslash
/ = slash, solidus
<> = angle brackets
¶ = paragraph mark, pilcrow sign
§ = section sign
º = degree symbol, ordinal indicator
× = multiplication sign
÷ = division sign
2 + 2 = sum
2 - 2 = difference
* - asterisk
: = colon
; = semicolon
^ = caret