I'm using Adobe Illustrator Creative Cloud (v.23.0.4) on OS X (v.10.14.5, Mojave). Illustrator will not display the handful of Unicode characters I am trying to use (∠∢⊾⊿⦣⦠⦟⦜⦝⦞⦛⦨). As a sanity check, I opened Text Edit to make sure they exist in the typeface I'm using — Helvetica Neue — and they appear to.
I noticed that if I changed the font in TextEdit, though, the glyphs (generally) did not change; as if OS X does some on-the-fly typeface substitution in that application that it (maybe) isn't able to do within Illustrator.
The Google research I did all turned up some variation of the same solution: use the Glyphs panel. Which I tried. Which brings me to my question. How do I search for a glyph by Unicode in the Illustrator Glyphs panel? Is there a way to see which typefaces support a given character without selecting each individually and scanning through all of its characters?
EDIT: Illustrator will display the glyphs in the Apple Symbols typeface. I suspect that's the face OS X uses in TextEdit