Code point
U+2321
Glyph appearance depends on your fonts.
U+2321
SmU+2321 BOTTOM HALF INTEGRAL is a Unicode 16.0.0 character in the Math Symbol category. It belongs to the Miscellaneous Technical block.
Choose the representation you need, then copy its value.
U+2321
8993
⌡
⌡
E2 8C A1
2321
00002321
%E2%8C%A1
\u2321
\u2321
\u2321
\2321