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