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, ΩM, and vacuum energy density, ΩL.[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]

1. ↑ Greek Omniglot
2. ↑ IPA pronunciation chart for English equivalentsGreek alphabet pronunciation and languageOmniglot
3. ↑ Omega pronunciation Ancient Greek tutorials, UC Berkeley
4. ↑ [1] Meteorite Book, Northern Arizona University
5. ↑ Curvature Astrophysics
6. ↑ Cosmological curvature Cosmology
7. ↑ [2] Wolfram Math World
8. ↑ [3] School of Computer Sciences, Carnegie Mellon University
9. ↑ [4] National Institute of Standards and Technology
10. ↑ Formal definition and basic properties Stochastic process
11. ↑ [5] JetStream – Online school for weather, National Weather Service
12. ↑ [6] Ask Oxford
13. ↑ [7]Wolfram Math World
14. ↑ [8] Merriam Webster Online
15. ↑ [9] Merriam Webster Online
16. ↑ Notation Natural number