Ø (disambiguation)

Ø (and ø) is a Scandinavian vowel letter.

The letter Ø or the symbol ∅ (a circle crossed by a diagonal slash) etc. may also refer to:

Language

Slashed zero (0̸), a representation of the number 0 (zero) to distinguish it from the letter O
The symbol for diameter (⌀), U+2300 in Unicode
A symbol to represent a phenyl group
Empty set ( $\varnothing$ or ∅ as a character) in mathematical set theory, U+2205 in Unicode

Ø, Denmark, a piece of land in Jutland, Denmark
Half-diminished seventh chord (^ø), in music
Ø, the solo identity of Finnish musician Mika Vainio of electronic music band Pan Sonic
Ø (Disambiguation), a 2010 studio album by Florida post-hardcore band Underoath

Voiceless bilabial fricative (IPA: ɸ)
Phi (Φ and φ), a Greek letter, corresponding to "f" or "ph"
- Several uses of phi as a symbol for angles, etc.
Ef (Cyrillic) (Ф and ф), a Cyrillic letter, corresponding to "f" or "ph"

Voiceless dental fricative (IPA: θ)
Theta (Θ and θ), a Greek letter, corresponding to "th"
Theta nigrum (ꝋ) for "obiit" ="died"
Fita (Ѳ and ѳ), an Old Cyrillic letter, corresponding to "f" and transliterating Greek theta
Oe (Cyrillic) (Ө and ө), Cyrillic barred O, representing an open-mid front rounded vowel in some Turkic and Mongolic languages
Yab (ⴱ), a Tifinagh letter, corresponding to "b"
Waterline (⦵), the line where the hull of a ship meets the surface of the water
Standard state (⦵), in chemistry