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 The symbol for diameter (⌀), U+2300 in Unicode A symbol to represent a phenyl group Empty set ( or ∅ as a character) in mathematical set theory, U+2205 in Unicode Other uses Latitude, for geographical coordinates 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 Similar symbols Circle with a diagonal slash Circled division slash (⊘), U+2298 in Unicode No entry sign (🚫), U+1F6AB 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" 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" Waterline (⦵), the line where the hull of a ship meets the surface of the water Standard state (⦵), in chemistry See also Null (disambiguation) Null symbol (disambiguation) Barred O (disambiguation) 0 (disambiguation) Theta (⦰), in trigonometry