Code point
U+235C
Glyph appearance depends on your fonts.
U+235C
SoU+235C APL FUNCTIONAL SYMBOL CIRCLE UNDERBAR is a Unicode 16.0.0 character in the Other Symbol category. It belongs to the Miscellaneous Technical block.
Choose the representation you need, then copy its value.
U+235C
9052
⍜
⍜
E2 8D 9C
235C
0000235C
%E2%8D%9C
\u235C
\u235C
\u235C
\235C