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