Code point
U+298C
Glyph appearance depends on your fonts.
U+298C
PeU+298C RIGHT SQUARE BRACKET WITH UNDERBAR is a Unicode 16.0.0 character in the Close Punctuation category. It belongs to the Miscellaneous Mathematical Symbols-B block.
Choose the representation you need, then copy its value.
U+298C
10636
⦌
⦌
⦌
E2 A6 8C
298C
0000298C
%E2%A6%8C
\u298C
\u298C
\u298C
\298C