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