aestheticsymbols
Use in a combo

Upper-right quadrant arc copy & paste

◝ is upper-right quadrant arc, a plain-text Unicode symbol from the Geometric Shapes block. On Aesthetic Symbols it lives in the borders & shapes 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+25DD
HTML entity
◝
CSS content
\25DD
JavaScript
\u{25DD}
UTF-8 bytes
E2 97 9D
Made of

U+25DD ◝ · Geometric Shapes

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.