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