Some Unicode characters that are occasionally handy:

• ❭ : ❭

  U+0276D MEDIUM RIGHT-POINTING ANGLE BRACKET ORNAMENT

  Handy as an ornamental separator. Used by <<menu>> macro.

• ``` : ```

  Triple back quotes.

  Use with <pre> tags for formatting things like Markdown or WikiText source code.

• ꤷ : ꤷ

  U+A937 REJANG LETTER BA

  Useful for adding a forward slash to a Tiddler title. Might not be available in all fonts — it is best to avoid using slashes in titles altogether.

• ​

  U+200B ZERO WIDTH SPACE

  Useful for preventing the Markdown auto-dingus from converting things like (​c) into ©.

• ＠: ＠

  U+FF20 FULL WIDTH COMMERCIAL AT

  Useful for email addresses that would otherwise be converted into hyperlinks which can cause problems with the very fragile Markdown parser.

• ☺: ☺

  U+263A WHITE SMILING FACE

• ☹: ☹

  U+2639 WHITE FROWNING FACE

See: https://www.compart.com/en/unicode/block/U+FF00 for half/full width versions of common characters that might be useful when auto-markup features are getting in the way.