Code point
U+234A
Glyph appearance depends on your fonts.
U+234A
SoU+234A APL FUNCTIONAL SYMBOL DOWN TACK 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+234A
9034
⍊
⍊
E2 8D 8A
234A
0000234A
%E2%8D%8A
\u234A
\u234A
\u234A
\234A