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