Code point
U+21B9
Glyph appearance depends on your fonts.
U+21B9
SoU+21B9 LEFTWARDS ARROW TO BAR OVER RIGHTWARDS ARROW TO BAR is a Unicode 16.0.0 character in the Other Symbol category. It belongs to the Arrows block.
Choose the representation you need, then copy its value.
U+21B9
8633
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E2 86 B9
21B9
000021B9
%E2%86%B9
\u21B9
\u21B9
\u21B9
\21B9