O
Octonion
Fraktur
Ordinal indicator
Unicode subscripts and superscripts
Enclosed Alphanumeric Supplement
Enclosed Alphanumerics
Ö
Ɵ
Ò
Õ
Ó
Ǫ
Open-mid back rounded vowel
Oʻ
Mid back rounded vowel
Ơ
Ø
Inverted breve
Breve
Ǫ́
Ꝍ
Mid front rounded vowel
Open O
O'
O͘
Bilabial click
ⱺ
Macron (diacritic)
Dot (diacritic)
Vietnamese alphabet
Circumflex
Hook above
Livonian language
Mid central vowel
Ogonek
Shift Out and Shift In characters
Nasal vowel
R-colored vowel
Double grave accent
Finno-Ugric transcription
Diethyl ether
Double acute accent
Scribal abbreviation
International Phonetic Alphabet
Ring (diacritic)
Cedilla
Small caps
Nasal bilabial click
Caron
O,O′-Diacetyldopamine
P&O
O visa
O,O′-Dipivaloyldopamine
O (disambiguation)
O-methylated flavonoid
O Antiphons
O-GlcNAc
O A e o Z
Douglas O-38
Pui O
O-Acetylbufotenine
O class
O line
O lucenti, o sereni occhi
O series
Big O
Tai O
Ping-O-Tronic
O. Henry Award
O Come, O Come, Emmanuel
Big O notation
O-Pivalylbufotenine
O Tannenbaum
O-ring
O (Cyrillic)
Yeshe-Ö
Ó Paí, Ó
Haplogroup O-M119
O Tempo e o Vento
P&O Cruises
O-type star
Isoflavone-7-O-beta-glucoside 6"-O-malonyltransferase
P&O Princess Cruises
O le Ao o le Malo
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
Ó Sé
Vitexin 2"-O-rhamnoside 7-O-methyltransferase
Protein O-GlcNAcase
Lycoming O-235
Asynchronous I/O
Cyanidin 3-O-rutinoside 5-O-glucosyltransferase
Delphinidin 3',5'-O-glucosyltransferase
O-type main-sequence star
Tam o' Shanter
Anthocyanin 3-O-glucoside 6''-O-hydroxycinnamoyltransferase
Cyanidin-3-O-glucoside 2-O-glucuronosyltransferase
Cyrillic O variants
Haplogroup O-M175
O tempora, o mores!
O (German magazine)
O Silêncio Q Precede O Esporro
The Big O
Haplogroup O-M268
Anti-streptolysin O
O scale
HNLMS O 20
THC-O-acetate
Subdwarf O star
Memory-mapped I/O and port-mapped I/O
W/o
O... Saya
Shibuya O-East
Jack-o'-lantern
Double-O
Séamus Ó Fearghail
Handley Page Type O
P&O Ferries
Te Pīhopatanga o Te Upoko o Te Ika
Yam O
Lycoming O-290
Te o Tsunagō/Ai o Utaō
USS O-12
Domnall Ó Cuindlis
Punk-O-Rama
Douglas O-2
'O pere e 'o musso
O-Zone
O-Bahn Busway
USS O-7
Continental O-200
Heme O
Te Pīhopatanga o Te Manawa o Te Wheke
Jell-O Gallery
I/O scheduling
Beta-glucogallin O-galloyltransferase
O-aew
Anthocyanin 5-O-glucoside 6'''-O-malonyltransferase
Ō clan
Man o' war
Jell-O
Ádhamh Ó Cianáin
Beta-glucogallin—tetrakisgalloylglucose O-galloyltransferase
Ō-yoroi
Five-O
Luteolin-7-O-diglucuronide 4'-O-glucuronosyltransferase
O, The Oprah Magazine
Páidí Ó Sé
Ó hUiginn
Sunn O)))
Steve O.
The Marquise of O
Diarmaid Ó Donnchadha
Mícheál Ó Cléirigh
O family
5-O-Methylmyricetin
O with diaeresis (Cyrillic)
Antoine Ó Raifteiri
Máirtín Ó Direáin
Tseung Kwan O line
O 12-class submarine
Channel I/O
Ō Rissei
Doyle O-2 Oriole
8-hydroxyfuranocoumarin 8-O-methyltransferase
Soleil O
Ó Flaithbheartaigh
Lycoming O-320
Triple-O
Flavanone 7-O-glucoside 2"-O-beta-L-rhamnosyltransferase
Cho-Den-O series
O. O. McIntyre
Five Pointe O
Big O Tires
O schöner Mai!
O Ta-ryŏn
Lycoming O-360
Yi O
N-acetylneuraminate 7-O(or 9-O)-acetyltransferase
USS O-6
O with tilde (Cyrillic)
Cruise-O-Matic
Lycoming O-435
O salutaris hostia
USS O-5
Maelbrighte Ó Hussey
HNLMS O 24
Tomás Ó Fiaich
O-Desmethylangolensin
Bit-O-Honey