Quick Calc

``` SPACE ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz 0123456789 @[]^_{}+,-./:

Dangerous: `|~<>"'#&()*;? TAB

Questionable: {}!%= ~ - can use if not first character in a line $ - on its own can be an operator, but not in fish % - used for job control than zsh = _ zsh ? is not ok ```