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