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