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