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