O
Unicode subscripts and superscripts
Octonion
Fraktur
Enclosed Alphanumeric Supplement
Ordinal indicator
Enclosed Alphanumerics
Ö
Ɵ
Oʻ
Õ
Ó
Ò
Ǫ
Ơ
ⱺ
Open-mid back rounded vowel
Mid back rounded vowel
Breve
Open O
Ꝍ
O'
Ǫ́
O͘
Mid front rounded vowel
Ø
Macron (diacritic)
Bilabial click
Vietnamese alphabet
Inverted breve
Nasal vowel
Circumflex
Double grave accent
Mid central vowel
R-colored vowel
Double acute accent
Livonian language
Dot (diacritic)
Scribal abbreviation
Cedilla
Ogonek
Finno-Ugric transcription
Hook above
International Phonetic Alphabet
Shift Out and Shift In characters
Ring (diacritic)
Diethyl ether
Nasal bilabial click
Caron
Small caps
O,O′-Diacetyldopamine
P&O
O,O′-Dipivaloyldopamine
O visa
O-methylated flavonoid
O (disambiguation)
O Antiphons
O-GlcNAc
O A e o Z
Douglas O-38
O-Acetylbufotenine
O class
O line
Pui O
O lucenti, o sereni occhi
O series
Tai O
O Come, O Come, Emmanuel
Big O notation
Big O
O. Henry Award
Ping-O-Tronic
O-Pivalylbufotenine
Haplogroup O-M119
O-ring
Yeshe-Ö
O Tannenbaum
O (Cyrillic)
Ó Paí, Ó
O Tempo e o Vento
O le Ao o le Malo
Isoflavone-7-O-beta-glucoside 6"-O-malonyltransferase
P&O Cruises
O-type star
P&O Princess Cruises
O-demethylpuromycin O-methyltransferase
O-linked glycosylation
Flavonol-3-O-beta-glucoside O-malonyltransferase
Daddy-O
Kamen Rider Den-O + Shin-O
Ó Rothláin
Pig-hoo-o-o-o-ey
O-Acetylserine
Google I/O
O-Bi, O-Ba: The End of Civilization
Asynchronous I/O
Protein O-GlcNAcase
Ó Lochlainn
Cyanidin 3-O-rutinoside 5-O-glucosyltransferase
Vitexin 2"-O-rhamnoside 7-O-methyltransferase
O-type main-sequence star
Ó Sé
Lycoming O-235
Cyanidin-3-O-glucoside 2-O-glucuronosyltransferase
Delphinidin 3',5'-O-glucosyltransferase
Memory-mapped I/O and port-mapped I/O
Tam o' Shanter
Anthocyanin 3-O-glucoside 6''-O-hydroxycinnamoyltransferase
O (German magazine)
Anti-streptolysin O
O scale
HNLMS O 20
Haplogroup O-M268
Haplogroup O-M175
P&O Ferries
Cyrillic O variants
THC-O-acetate
USS O-12
O Silêncio Q Precede O Esporro
Subdwarf O star
W/o
Handley Page Type O
Jack-o'-lantern
O... Saya
Double-O
Shibuya O-East
The Big O
O tempora, o mores!
Continental O-200
Te Pīhopatanga o Te Upoko o Te Ika
Yam O
Te o Tsunagō/Ai o Utaō
Lycoming O-290
O-Zone
Séamus Ó Fearghail
Domnall Ó Cuindlis
'O pere e 'o musso
USS O-7
Te Pīhopatanga o Te Manawa o Te Wheke
I/O scheduling
Punk-O-Rama
Anthocyanin 5-O-glucoside 6'''-O-malonyltransferase
O, The Oprah Magazine
Heme O
Páidí Ó Sé
Douglas O-2
Jell-O Gallery
Beta-glucogallin O-galloyltransferase
Beta-glucogallin—tetrakisgalloylglucose O-galloyltransferase
Ō clan
Five-O
O-aew
O-Bahn Busway
Luteolin-7-O-diglucuronide 4'-O-glucuronosyltransferase
Ó hUiginn
Ádhamh Ó Cianáin
Steve O.
Ō-yoroi
Man o' war
Máirtín Ó Direáin
The Marquise of O
Jell-O
Channel I/O
Mícheál Ó Cléirigh
O family
Diarmaid Ó Donnchadha
Antoine Ó Raifteiri
Soleil O
8-hydroxyfuranocoumarin 8-O-methyltransferase
Tseung Kwan O line
5-O-Methylmyricetin
Sunn O)))
Lycoming O-360
O 12-class submarine
Five Pointe O
Ō Rissei
Flavanone 7-O-glucoside 2"-O-beta-L-rhamnosyltransferase
Doyle O-2 Oriole
Triple-O
USS O-6
Lycoming O-320
Ó Flaithbheartaigh
Big O Tires
O schöner Mai!
Cho-Den-O series
Lycoming O-435
N-acetylneuraminate 7-O(or 9-O)-acetyltransferase
HNLMS O 24
Tomás Ó Fiaich
O Ta-ryŏn
Yi O
O with tilde (Cyrillic)
USS O-5
Cruise-O-Matic
O. O. McIntyre
T and O map
Maelbrighte Ó Hussey
O-Desmethylangolensin
Bit-O-Honey
Fionntán Ó Súilleabháin