aestheticsymbols
Use in a combo

First-quarter moon copy & paste

☽ is first-quarter moon, a plain-text Unicode symbol from the Miscellaneous Symbols block. It also goes by moon glyph. On Aesthetic Symbols it lives in the stars & celestial and zodiac & astro collections, tagged moon. As plain text it takes on the font and colour of wherever you paste it — a bio, a username, a caption or a stream title.

Unicode
U+263D
HTML entity
☽
CSS content
\263D
JavaScript
\u{263D}
UTF-8 bytes
E2 98 BD
Made of

U+263D ☽ · Miscellaneous Symbols

Will it show up? · Long-established text symbols

Plain-text characters from blocks that mainstream desktop and mobile fonts have covered for years. These are the safe ones.

Worked out from how each character is encoded, not from a test on a real device.

Combos with ☽