Omega (letter)

Omega (Ω ω) (literally, big O) is the 24th and last letter of the Greek alphabet. In the Greek numeric system it had a value of 800.

Omega is used to denote an end to something, the opposite being Alpha, beginning. For example, "I am the Alpha and the Omega, the First and the Last, the Beginning and the End." (Revelation 22:13, NIV)

Omega has been used as the name for a wide variety of other things, for example:

• The name of the free 16-Bit (Unicode) version of the typesetting system TeX ([1])
• a fictional character from the television program Doctor Who.
• a Roguelike game ([1])

The upper-case letter Ω is used as a symbol for:

• Ohm - S-I unit of electrical resistance.
• In computer science, in notation related to Big O notation, also Chaitin's constant.
• Codex Athous Dionysii, an 8th/9th century uncial Greek manuscript of the Gospels on Mount Athos.
• Omega Point, a theory about computing at the end of the universe.

The lower-case letter ω is used as a symbol for:

• In textual criticism, the archetype of a manuscript tradition.
• In physics, angular velocity.
• In mathematics, the first transfinite ordinal number

See also:

• Alpha - Beta - Gamma - Delta - Epsilon - Digamma - Zeta - Eta - Theta - Iota - Kappa - Lambda - Mu - Nu - Xi - Omicron - Pi - San - Qoppa - Rho - Sigma - Tau - Upsilon - Phi - Chi - Psi - Omega - Sampi