Code point
U+2370
Glyph appearance depends on your fonts.
U+2370
SoU+2370 APL FUNCTIONAL SYMBOL QUAD QUESTION 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+2370
9072
⍰
⍰
E2 8D B0
2370
00002370
%E2%8D%B0
\u2370
\u2370
\u2370
\2370