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

 * Close-mid front rounded vowel (IPA: )
 * Zero (linguistics) (∅)
 * Berber Academy yah (ⵁ), a Tifinagh letter, corresponding to "h"

Science, technology and engineering

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

Other uses

 * Ø, Denmark, a piece of land in Jutland, Denmark
 * Half-diminished seventh chord, 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

Circle with a diagonal slash

 * Circled division slash (⊘),  in Unicode
 * No entry sign (🚫),  in Unicode

Circle crossed by a vertical bar

 * 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"

Circle with a vertical bar

 * Yah (ⵀ), a Tifinagh letter, corresponding to "h" or "b"

Circle with a horizontal bar

 * 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"
 * Load line mark (⦵), showing the maximum draft of a ship
 * Standard state (⦵), in chemistry