Code point
U+2395
Glyph appearance depends on your fonts.
U+2395
SoU+2395 APL FUNCTIONAL SYMBOL QUAD 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+2395
9109
⎕
⎕
E2 8E 95
2395
00002395
%E2%8E%95
\u2395
\u2395
\u2395
\2395