What ⇎ means
It says the two sides fail the stated equivalence rule.
That rule tells you what counts as equivalent in this context. ⇎ is ⇔ with a stroke overlay; in A ⇎ B, the two expressions do not meet the rule being tested.
Formal and technical; it belongs in equations, proofs, and logic, where the tested relation is clear.
It denies equivalence, not a generic “no.”
Don't confuse it with
1Questions people ask
1Is ⇎ the same as ≠?
No. ⇎ denies a specified equivalence relation; ≠ states that two expressions are unequal. Use the operator that matches the relation you are testing.
How to type ⇎
Windows (Word)
Alt+XType 21CE, then Alt+X to get ⇎.
Windows
Win+Rrun charmap for the full table, or use the emoji picker's Ω symbols tab (Win + .).
macOS
Control+Command+SpaceOpen the character viewer and search “left right double arrow with stroke”.
Linux
Ctrl+Shift+UType 21ce, then Enter or Space.
HTML
⇎CSS
\21CE\nLeftrightarrow
How to type ⇎ in Microsoft Word equation input: enter this command and let the editor convert it. As of 2026-09-04, Microsoft lists it for this symbol.
Codes and encoding1 code points
HTML decimal
⇎
HTML hex
⇎
CSS content
content: "\21CE";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%87%8E
1
On screen
1
Code points
1
JS .length
3
UTF-8 bytes
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.