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