You need to pick a font which has the character (glyph) you want to use. This is easy on a Mac if you use these steps:
(1) In System Preferences > Language & Text > Input Sources, turn on Keyboard & Character Viewer (at the top of the list).
(2) Open the Character Viewer from the menulet at the top of your screen:
(3) In the Character Viewer, select Unicode and select the Unicode value:
(4) Select one of the Font Variations on the right and observe the font with that glyph:
(5) Return to InDesign and open the Glyphs panel (Type > Glyphs). In the menu select the font, in this case Charcoal CY. From the menu of glyphs for that font, select Symbols. Double-click to insert the symbol.
(6) To reuse the glyph, include it in a Glyph Set.
Steve: Thank you ever so much, that had been doing my head in. Worked exactly as described.
PS: If you can't see Unicode showing in charachter palette, then follow these instructions to show it:
The unicode option is not visible in the character viewer, and the link provided above to make it visible no longer works...so what are my options now?
There is a "gear" icon at the upper left of the panel. Click on it and choose Customize List. Scroll down to the section called Code Tables. Check Unicode.
It's under Misc. Technical