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