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