aestheticsymbols
Use in a combo

Twelve-pointed star copy & paste

✹ is twelve-pointed star, a plain-text Unicode symbol from the Dingbats block. On Aesthetic Symbols it lives in the stars & celestial collection, tagged star. 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+2739
HTML entity
✹
CSS content
\2739
JavaScript
\u{2739}
UTF-8 bytes
E2 9C B9
Made of

U+2739 ✹ · Dingbats

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.