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