For the strain of the virus causing COVID-19, see SARS-CoV-2 Omicron variant. For other uses, see Omicron (disambiguation).
Not to be confused with the Latin letter O, the Cyrillic letter Ο or Omnicron.
Greek alphabet
Αα
Alpha
Νν
Nu
Ββ
Beta
Ξξ
Xi
Γγ
Gamma
Οο
Omicron
Δδ
Delta
Ππ
Pi
Εε
Epsilon
Ρρ
Rho
Ζζ
Zeta
Σσς
Sigma
Ηη
Eta
Ττ
Tau
Θθ
Theta
Υυ
Upsilon
Ιι
Iota
Φφ
Phi
Κκ
Kappa
Χχ
Chi
Λλ
Lambda
Ψψ
Psi
Μμ
Mu
Ωω
Omega
History
Archaic local variants
Ϝ
Ͱ
Ϻ
Ϙ
Ͳ
Ͷ
tsan
digamma
Diacritics
Ligatures
Numerals
ϛ (6)
ϟ (90)
ϡ (900)
Use in other languages
Bactrian
Coptic
Albanian
Related topics
Use as scientific symbols
Category
v
t
e
Omicron (US: /ˈoʊmɪkrɒn,ˈɒmɪkrɒn/, UK: /oʊˈmaɪkrɒn/;[1] uppercase Ο, lowercase ο, Greek: όμικρον) is the fifteenth letter of the Greek alphabet. This letter is derived from the Phoenician letter ayin: . In classical Greek, omicron represented the close-mid back rounded vowel IPA:[o] in contrast to omega which represented the open-mid back rounded vowel IPA:[ɔː] and the digraph ου which represented the long close-mid back rounded vowel IPA:[oː]. In modern Greek, both omicron and omega represent the mid back rounded vowel IPA:[o̞] or IPA:[ɔ̝]. Letters that arose from omicron include Roman O and Cyrillic O. The word literally means "little O" (o mikron) as opposed to "great O" (ō mega).[2] In the system of Greek numerals, omicron has a value of 70.
^"omicron". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
Omicron (US: /ˈoʊmɪkrɒn, ˈɒmɪkrɒn/, UK: / oʊˈmaɪkrɒn/; uppercase Ο, lowercase ο, Greek: όμικρον) is the fifteenth letter of the Greek alphabet. This letter...
Omicron acapulsece is a species of neotropical wasps that belongs to the genus Omicron and is found in South and Central America. It was discovered by...
sound is due to the early Greek alphabets, which adopted the letter of O "omicron" to represent the vowel /o/. The letter was adopted with the value in the...
literally means "great O" (ō mega, mega meaning "great"), as opposed to omicron, which means "little O" (o mikron, micron meaning "little"). In phonetic...
Omicron Persei (ο Persei, abbreviated Omicron Per, ο Per) is a triple star system in the constellation of Perseus. From parallax measurements taken during...
Omicron Nu (ΟΝ) was an American honor society for home economics. It was established at Michigan Agricultural College in 1912. In 1951, Omicron Nu was...
Omicron Delta Kappa (ΟΔΚ), also known as The Circle and ODK, is an honor society located in the United States with chapters at more than 300 college campuses...
Omicron Leonis (ο Leonis, abbreviated Omicron Leo, ο Leo) is a multiple star system in the constellation of Leo, west of Regulus, some 130 light-years...
Mira (/ˈmaɪrə/), designation Omicron Ceti (ο Ceti, abbreviated Omicron Cet, ο Cet), is a red-giant star estimated to be 200–300 light-years from the Sun...
ο Eridani (Latinised as Omicron Eridani) refers to 2 distinct star systems in the constellation Eridanus: Omicron1 Eridani (ο1 Eridani), or 38 Eridani...
Omicron Islands is a group of small islands and rocks which lie close southeast of Omega Island in the Melchior Islands, Palmer Archipelago. The name...
Delta Omicron (ΔΟ) is a co-ed international professional music honors fraternity whose mission is to promote and support excellence in music and musicianship...
Omicron Hill (elevation: 981 feet (299 m)) is a summit in North Slope Borough, Alaska, in the United States. Omicron Hill took its name from a surveyor's...
Omicron Delta Epsilon (ΟΔΕ or ODE) is an international honor society in the field of economics, formed from the merger of Omicron Delta Gamma and Omicron...
Alpha Omicron Pi (ΑΟΠ, AOII, Alpha O) is an international women's fraternity founded on January 2, 1897, at Barnard College on the campus of Columbia...
Omicron Kappa Epsilon (OΚΕ), commonly known as The Fraternal Society, is a North American fraternity founded at Union College in 1834. It is the sixth...
Lancia Omicron is a bus chassis produced by the Italian manufacturer Lancia. Production of the Omicron started in 1927 and ended in 1936 after 601 total...
This is the list of notable stars in the constellation Octans, sorted by decreasing brightness. List of stars by constellation ESA (1997). "The Hipparcos...
This is the list of notable stars in the constellation Libra, sorted by decreasing brightness. List of stars by constellation Color=Blue ESA (1997). "The...
Omicron Kappa Upsilon (ΟΚΥ) is a national honorary society serving the field of dentistry. The Society originated with the 1914 graduating class of the...
Delta Omicron is a co-ed international professional music honors fraternity. Following is a list of Delta Omicron chapters. Following is a list of Delta...
The Bayer designation Omicron Cygni (ο Cyg / ο Cygni) is shared by two or three star systems in the constellation Cygnus. Application of the superscripts...
The Bulgarian Navy (Bulgarian: Военноморски сили на Република България, romanized: Voennomorski sili na Republika Balgariya, lit. 'Military-maritime Forces...
Global Information
. In classical Greek, omicron represented the close-mid back rounded vowel IPA: [o] in contrast to omega which represented the open-mid back rounded vowel IPA: [ɔː] and the digraph ου which represented the long close-mid back rounded vowel IPA: [oː]. In modern Greek, both omicron and omega represent the mid back rounded vowel IPA: [o̞] or IPA: [ɔ̝]. Letters that arose from omicron include Roman O and Cyrillic O. The word literally means "little O" (o mikron) as opposed to "great O" (ō mega).[2] In the system of Greek numerals, omicron has a value of 70.