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