O
Unicode subscripts and superscripts
Enclosed Alphanumeric Supplement
Ordinal indicator
Octonion
Fraktur
Enclosed Alphanumerics
Ö
Oʻ
Ɵ
Ơ
Ǫ
Ò
ⱺ
Ó
Open O
Open-mid back rounded vowel
Õ
O'
Inverted breve
Mid back rounded vowel
Ǫ́
Breve
O͘
Mid front rounded vowel
Circumflex
Ø
Ꝍ
Bilabial click
Double acute accent
Mid central vowel
Dot (diacritic)
Nasal vowel
Vietnamese alphabet
Macron (diacritic)
International Phonetic Alphabet
Double grave accent
Cedilla
Diethyl ether
Hook above
Livonian language
Shift Out and Shift In characters
Ogonek
R-colored vowel
Scribal abbreviation
Finno-Ugric transcription
Ring (diacritic)
Small caps
Nasal bilabial click
Caron
O,O′-Diacetyldopamine
P&O
O,O′-Dipivaloyldopamine
O visa
O-methylated flavonoid
O (disambiguation)
O-GlcNAc
O Antiphons
O A e o Z
Douglas O-38
O-Acetylbufotenine
Pui O
O class
O line
O series
O lucenti, o sereni occhi
Tai O
Big O
O Come, O Come, Emmanuel
Ping-O-Tronic
O. Henry Award
O (Cyrillic)
Big O notation
O-Pivalylbufotenine
Haplogroup O-M119
O-ring
Yeshe-Ö
O Tannenbaum
Ó Paí, Ó
O Tempo e o Vento
P&O Cruises
O-type star
P&O Princess Cruises
O le Ao o le Malo
Isoflavone-7-O-beta-glucoside 6"-O-malonyltransferase
O-linked glycosylation
Ó Rothláin
O-demethylpuromycin O-methyltransferase
Pig-hoo-o-o-o-ey
Flavonol-3-O-beta-glucoside O-malonyltransferase
Daddy-O
Kamen Rider Den-O + Shin-O
O-Acetylserine
O-Bi, O-Ba: The End of Civilization
O-type main-sequence star
Ó Lochlainn
Asynchronous I/O
Vitexin 2"-O-rhamnoside 7-O-methyltransferase
Protein O-GlcNAcase
Cyanidin 3-O-rutinoside 5-O-glucosyltransferase
Google I/O
Ó Sé
Lycoming O-235
Cyanidin-3-O-glucoside 2-O-glucuronosyltransferase
Delphinidin 3',5'-O-glucosyltransferase
Jell-O
Tam o' Shanter
Anti-streptolysin O
O scale
Memory-mapped I/O and port-mapped I/O
Anthocyanin 3-O-glucoside 6''-O-hydroxycinnamoyltransferase
Haplogroup O-M175
Cyrillic O variants
O Silêncio Q Precede O Esporro
HNLMS O 20
Haplogroup O-M268
The Big O
THC-O-acetate
Subdwarf O star
Shibuya O-East
Jack-o'-lantern
Te Pīhopatanga o Te Upoko o Te Ika
O (German magazine)
Handley Page Type O
O tempora, o mores!
O... Saya
Yam O
Te o Tsunagō/Ai o Utaō
Double-O
P&O Ferries
W/o
Continental O-200
USS O-12
O-Zone
Lycoming O-290
Séamus Ó Fearghail
Domnall Ó Cuindlis
Punk-O-Rama
Heme O
Te Pīhopatanga o Te Manawa o Te Wheke
'O pere e 'o musso
I/O scheduling
Anthocyanin 5-O-glucoside 6'''-O-malonyltransferase
Páidí Ó Sé
O-aew
Beta-glucogallin O-galloyltransferase
Jell-O Gallery
USS O-7
Beta-glucogallin—tetrakisgalloylglucose O-galloyltransferase
Ō-yoroi
Ō clan
Five-O
O-Bahn Busway
Luteolin-7-O-diglucuronide 4'-O-glucuronosyltransferase
Ó hUiginn
Man o' war
Douglas O-2
The Marquise of O
O, The Oprah Magazine
Steve O.
Ádhamh Ó Cianáin
Mícheál Ó Cléirigh
Diarmaid Ó Donnchadha
O family
5-O-Methylmyricetin
Antoine Ó Raifteiri
Tseung Kwan O line
8-hydroxyfuranocoumarin 8-O-methyltransferase
O 12-class submarine
Máirtín Ó Direáin
Sunn O)))
Flavanone 7-O-glucoside 2"-O-beta-L-rhamnosyltransferase
Channel I/O
Lycoming O-360
Doyle O-2 Oriole
Ō Rissei
Soleil O
Triple-O
Lycoming O-320
Laugh-O-Gram Studio
Lycoming O-435
Big O Tires
O. O. McIntyre
N-acetylneuraminate 7-O(or 9-O)-acetyltransferase
Tomás Ó Fiaich
Cho-Den-O series
Cruise-O-Matic
O Ta-ryŏn
Five Pointe O
O with macron (Cyrillic)
O-Desmethylangolensin
USS O-6
Yi O
USS O-5
O schöner Mai!
Ó Flaithbheartaigh
O gaúcho
Maelbrighte Ó Hussey
HNLMS O 24
O with tilde (Cyrillic)