Code point
U+21FD
Glyph appearance depends on your fonts.
U+21FD
SmU+21FD LEFTWARDS OPEN-HEADED ARROW is a Unicode 16.0.0 character in the Math Symbol category. It belongs to the Arrows block.
Choose the representation you need, then copy its value.
U+21FD
8701
⇽
⇽
⇽
E2 87 BD
21FD
000021FD
%E2%87%BD
\u21FD
\u21FD
\u21FD
\21FD