Code point
U+2423
Glyph appearance depends on your fonts.
U+2423
SoU+2423 OPEN BOX is a Unicode 16.0.0 character in the Other Symbol category. It belongs to the Control Pictures block.
Choose the representation you need, then copy its value.
U+2423
9251
␣
␣
␣
E2 90 A3
2423
00002423
%E2%90%A3
\u2423
\u2423
\u2423
\2423