aestheticsymbols
Use in a combo

Mercury copy & paste

☿ is mercury, a plain-text Unicode symbol from the Miscellaneous Symbols block. On Aesthetic Symbols it lives in the zodiac & astro collection. 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+263F
HTML entity
☿
CSS content
\263F
JavaScript
\u{263F}
UTF-8 bytes
E2 98 BF
Made of

U+263F ☿ · 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.