Code point
U+2B3B
Glyph appearance depends on your fonts.
U+2B3B
SmU+2B3B LEFTWARDS TWO-HEADED ARROW WITH TAIL is a Unicode 16.0.0 character in the Math Symbol category. It belongs to the Miscellaneous Symbols and Arrows block.
Choose the representation you need, then copy its value.
U+2B3B
11067
⬻
⬻
E2 AC BB
2B3B
00002B3B
%E2%AC%BB
\u2B3B
\u2B3B
\u2B3B
\2B3B