Code point
U+FF3F
Glyph appearance depends on your fonts.
U+FF3F
Pc<wide> 005FU+FF3F FULLWIDTH LOW LINE is a Unicode 16.0.0 character in the Connector Punctuation category. It belongs to the Halfwidth and Fullwidth Forms block.
Choose the representation you need, then copy its value.
U+FF3F
65343
_
_
EF BC BF
FF3F
0000FF3F
%EF%BC%BF
\uFF3F
\uFF3F
\uFF3F
\FF3F