Code point
U+2300
Glyph appearance depends on your fonts.
U+2300
SoU+2300 DIAMETER SIGN 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+2300
8960
⌀
⌀
E2 8C 80
2300
00002300
%E2%8C%80
\u2300
\u2300
\u2300
\2300