GlyphIndexNo matching elements
{1, 2} ∩ {3, 4} = ∅The two sets have no members in common.
Empty-set sign
The empty-set symbol ∅ means a set with no elements. It is neither the number 0 nor the set {0}.
EMPTY SET
Appearance can vary by font.
Character details
♡→✦
3 code pointsMeaning and context
The empty-set symbol ∅ means a set with no elements. It is neither the number 0 nor the set {0}.
How to use it
Use ∅ when a set-valued result has no members. If writing for readers new to sets, explain it as “the empty set” at first use.
Examples
Different objects
∅ ≠ {0}The right-hand set contains one element; the left-hand set contains none.
Similar shapes, different characters
Latin capital O with stroke
U+00D8This is a letter, U+00D8.
Digit zero
U+0030Zero is a number and can itself be a member of a set.
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.