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