GlyphIndexLabeled use
n is even ⇔ n = 2k for some integer k
This characterizes even integers in both directions.
Left-right double arrow
The left-right double arrow ⇔ often means logical equivalence: each statement implies the other. Check both directions before using it.
LEFT RIGHT DOUBLE ARROW
Appearance can vary by font.
Character details
♡→✦
3 code pointsMeaning and context
The left-right double arrow ⇔ often means logical equivalence: each statement implies the other. Check both directions before using it.
How to use it
Check both implication directions before writing an equivalence. Similar-looking single-stem ↔ is separately encoded and may follow another notation convention.
Examples
Second context
x + 3 = 8 ⇔ x = 5
The algebraic statements have the same solutions over the real numbers.
Similar shapes, different characters
Left-right arrow
U+2194Compare the arrowhead direction and stem before choosing the character.
DetailsLeft-right double arrow
U+21D4The code-point display identifies this exact character even when another font changes its appearance.
Sources and method
- Unicode 18.0.0 character database — Pinned standard character identities and properties; the application computes UTF encodings from the original text.
- Unicode character code charts — Reference glyphs are not a guarantee of the appearance in a user’s font.