I’m becoming accustomed to the 140-character limit on Twitter posts, and I’m abbreviating (2 for “to,” 4 for “for,” and so forth) when I have to. But I also see an opportunity for character-shaving that most others are not using, perhaps because of inconvenience. So, as a public service, here are some one-character punctuation marks for you to copy and paste, together with the Windows keyboard shortcuts and Mac keyboard shortcuts (last column, submitted by an anonymous commenter) if you’d rather type them yourself.
The following have no shortcuts, but you can copy and paste.
Replace "..." with ellipsis … Alt+0133 Opt+;
Replace "--" with em dash — Alt+0151 Opt+Shift+-
Replace " - " with en dash – Alt+0150 Opt+-
Replace " + " with bullet • Alt+0149 Opt+8
Replace " | " with pilcrow ¶ Alt+0182 Opt+7
Replace "ae" with ligature æ Alt+0230
Replace "oe" with ligature œ Alt+0156
Replace RT with ℞ but cpdavey suggests recycling symbol, ♺
Replace !? with ‽
Replace fi with ﬁ
Replace fl with ﬂ
Replace No with №
Do you have others you would like me to add?