I was missing some glyphs for unicode emojis in my preferred Gemini client - Elpher. A missing glyph is displayed as a rectangle containing its hex number. Some sites use emojis (e.g., mozz.us), so I wanted to fix that to see them properly.
To add the missing glyphs I installed the Ubuntu package `ttf-ancient-fonts-symbola` (although `fonts-symbola` might be sufficient). By the way, my Ubuntu version is 20.04. After that I installed the Melpa package `unicode-fonts` and executed `M-x unicode-fonts-setup`.
Now I can see emoji glyphs in Elpher (and Emacs generally). That's nice! 🙂
More about the `unicode-fonts` package can be found here: