Code point
U+235A
Glyph appearance depends on your fonts.
U+235A
SoU+235A APL FUNCTIONAL SYMBOL DIAMOND 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+235A
9050
⍚
⍚
E2 8D 9A
235A
0000235A
%E2%8D%9A
\u235A
\u235A
\u235A
\235A