Find the font used to render a character, or containing the glyph?
See there for an answer (if your GNOME version has not deprecated the feature)
https://fedoraproject.org/wiki/Identifying_fonts
You can use fontconfig:
fc-list ':charset=<hex_code1> <hex_code2>'
For details see https://unix.stackexchange.com/a/393740/14907
For bash script see gist.github.com/akostadinov/202550a1e2fd4ea8cf523d91b437fa09
#!/usr/bin/env bash
# example: ./font_find.sh ð©︎
# credits: David Baynard, https://unix.stackexchange.com/a/393740/14907
param="$1"
char=${param:0:1}
printf '%x' \'"$char" | xargs -I{} fc-list ":charset={}"
Alternative Python solution here: https://superuser.com/a/1452828/111432
From the Fedora wiki.
Looking up this glyph in the
gucharmap
application, using the same font family, is usually sufficient to learn where it's taken from. Gucharmap will display the origin font when you right-click on a glyph.
sudo apt install gucharmap