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