Code point
U+FF03
Glyph appearance depends on your fonts.
U+FF03
Po<wide> 0023U+FF03 FULLWIDTH NUMBER SIGN is a Unicode 16.0.0 character in the Other Punctuation category. It belongs to the Halfwidth and Fullwidth Forms block.
Choose the representation you need, then copy its value.
U+FF03
65283
#
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EF BC 83
FF03
0000FF03
%EF%BC%83
\uFF03
\uFF03
\uFF03
\FF03