O
Unicode subscripts and superscripts
Ordinal indicator
Enclosed Alphanumeric Supplement
Octonion
Fraktur
Enclosed Alphanumerics
Ö
Ó
Ɵ
Ǫ
Ơ
Oʻ
Open-mid back rounded vowel
Õ
Mid back rounded vowel
Ò
Open O
O'
Ǫ́
Mid front rounded vowel
ⱺ
Breve
Ꝍ
O͘
Vietnamese alphabet
Ø
Inverted breve
Double acute accent
Mid central vowel
Macron (diacritic)
Bilabial click
Circumflex
Dot (diacritic)
Cedilla
Scribal abbreviation
Nasal vowel
Double grave accent
Hook above
R-colored vowel
Livonian language
Shift Out and Shift In characters
Ogonek
International Phonetic Alphabet
Finno-Ugric transcription
Diethyl ether
Ring (diacritic)
Small caps
Nasal bilabial click
Caron
O,O′-Diacetyldopamine
P&O
O visa
O,O′-Dipivaloyldopamine
O-methylated flavonoid
O (disambiguation)
O-GlcNAc
O A e o Z
O Antiphons
Douglas O-38
O-Acetylbufotenine
O line
O class
Pui O
O lucenti, o sereni occhi
O series
Tai O
O. Henry Award
Big O
Ping-O-Tronic
O Come, O Come, Emmanuel
Big O notation
O-ring
O-Pivalylbufotenine
Yeshe-Ö
Haplogroup O-M119
O Tannenbaum
O Tempo e o Vento
O (Cyrillic)
Ó Paí, Ó
P&O Cruises
O-type star
O le Ao o le Malo
Isoflavone-7-O-beta-glucoside 6"-O-malonyltransferase
P&O Princess Cruises
O-linked glycosylation
O-demethylpuromycin O-methyltransferase
Flavonol-3-O-beta-glucoside O-malonyltransferase
Daddy-O
Pig-hoo-o-o-o-ey
O-Bi, O-Ba: The End of Civilization
Kamen Rider Den-O + Shin-O
Google I/O
O-Acetylserine
Vitexin 2"-O-rhamnoside 7-O-methyltransferase
Ó Rothláin
Ó Sé
Ó Lochlainn
Protein O-GlcNAcase
Asynchronous I/O
Delphinidin 3',5'-O-glucosyltransferase
Cyanidin 3-O-rutinoside 5-O-glucosyltransferase
Lycoming O-235
Tam o' Shanter
Cyanidin-3-O-glucoside 2-O-glucuronosyltransferase
Anthocyanin 3-O-glucoside 6''-O-hydroxycinnamoyltransferase
Cyrillic O variants
O-type main-sequence star
The Big O
Anti-streptolysin O
O scale
Haplogroup O-M268
Memory-mapped I/O and port-mapped I/O
HNLMS O 20
O (German magazine)
W/o
Handley Page Type O
THC-O-acetate
Haplogroup O-M175
O tempora, o mores!
Subdwarf O star
Jack-o'-lantern
O Silêncio Q Precede O Esporro
O... Saya
Shibuya O-East
Double-O
Te Pīhopatanga o Te Upoko o Te Ika
P&O Ferries
Te o Tsunagō/Ai o Utaō
Yam O
Domnall Ó Cuindlis
Continental O-200
'O pere e 'o musso
USS O-12
O-Zone
Lycoming O-290
Punk-O-Rama
Te Pīhopatanga o Te Manawa o Te Wheke
O-Bahn Busway
Séamus Ó Fearghail
Heme O
USS O-7
Douglas O-2
I/O scheduling
Beta-glucogallin O-galloyltransferase
Anthocyanin 5-O-glucoside 6'''-O-malonyltransferase
Jell-O Gallery
Ō clan
Luteolin-7-O-diglucuronide 4'-O-glucuronosyltransferase
O-aew
Beta-glucogallin—tetrakisgalloylglucose O-galloyltransferase
Ó hUiginn
Páidí Ó Sé
Ádhamh Ó Cianáin
Jell-O
Ō-yoroi
Five-O
Mícheál Ó Cléirigh
O, The Oprah Magazine
The Marquise of O
Diarmaid Ó Donnchadha
Steve O.
Man o' war
O family
5-O-Methylmyricetin
Tseung Kwan O line
Antoine Ó Raifteiri
Channel I/O
O 12-class submarine
Sunn O)))
Máirtín Ó Direáin
8-hydroxyfuranocoumarin 8-O-methyltransferase
Ō Rissei
Doyle O-2 Oriole
Lycoming O-320
Flavanone 7-O-glucoside 2"-O-beta-L-rhamnosyltransferase
Cho-Den-O series
Soleil O
Triple-O
Ó Flaithbheartaigh
Lycoming O-360
Big O Tires
Lycoming O-435
O Ta-ryŏn
O. O. McIntyre
O schöner Mai!
Five Pointe O
N-acetylneuraminate 7-O(or 9-O)-acetyltransferase
Yi O
O with tilde (Cyrillic)
Tomás Ó Fiaich
USS O-5
HNLMS O 24
USS O-6
O-Desmethylangolensin
Cruise-O-Matic
Fionntán Ó Súilleabháin
Bit-O-Honey
5-hydroxyfuranocoumarin 5-O-methyltransferase
O 21-class submarine