Omega (Greek letter)

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Omega (uppercase Ω, lowercase ω) is the 24th and last letter of the Greek alphabet.^[1] In the Greek numeric system, it has a value of 800. Pronounced [ɔ:] or 'aw' as in 'raw'.^[2][3]

Symbol uppercase Ω[edit]

Astronomy

• Density of the universe, also referred to as the cosmological density parameter. with components of mass density, Ω_M, and vacuum energy density, Ω_L.^[4][5][6]

Chemistry

• Designation for the last carbon on the chain in a fatty acid

Electricity

• Ohm: SI unit of electrical resistance
• Siemens (unit), abbreviated S, is the reciprocal of the ohm.

Mathematics

• Omega constant (Lambert’s W function)^[7]
• Chaitin’s constant: the probability that a randomly selected valid program string is interpreted by a halting

term^[8]

• Calculus: a 2-D region
• A theoretical measure of the execution of an algorithm, (e.g. required time or memory) given the problem size n (e.g. the number of items).^[9]
• Stochastic process^[10]

Meteorology

• Used to designate vertical motion in the atmosphere^[11]

Statistics

• Sample space
• Set of possible outcomes

Literary

• End or last thing in a series^[12]

Physics

• Solid angle or rate of precession in a gyroscope^[13]
• Omega baryons (particle physics)
• Negatively charged elementary particle with a mass 3270 times the mass of an electron.^[14]
• Omega minus b: a very short-lived unstable meson with mass 1532 times the mass of an electron (aka omega meson)^[15]

Symbol lowercase ω[edit]

Mathematics

• The set of all natural numbers^[16]

Physics

• Angular frequency

References[edit]