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