Code point
U+3012
Glyph appearance depends on your fonts.
U+3012
SoU+3012 POSTAL MARK is a Unicode 16.0.0 character in the Other Symbol category. It belongs to the CJK Symbols and Punctuation block.
Choose the representation you need, then copy its value.
U+3012
12306
〒
〒
E3 80 92
3012
00003012
%E3%80%92
\u3012
\u3012
\u3012
\3012