Omega

letter in the Greek alphabet
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Omega (uppercase/lowercase Ω ω), is the 24th and last letter of the Greek alphabet. It stood for a long "o" sound in Ancient Greek. It still stands for "o" in Modern Greek, but there is no longer a difference between long and short vowels, so it sounds the same as Omicron. In the system of Greek numerals, it stands for the number 800.

Omega uc lc.svg
Greek alphabet
Αα Alpha Νν Nu
Ββ Beta Ξξ Xi
Γγ Gamma Οο Omicron
Δδ Delta Ππ Pi
Εε Epsilon Ρρ Rho
Ζζ Zeta Σσ 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
Other letters
Ϝϝ Digamma Ϟϟ Koppa
Ϛϛ Stigma Ϡϡ Sampi
Ͱͱ Heta Ϸϸ Sho
Ϻϻ San
CategoryCommons

There was also once a letter "Omega" Ѡ in the Cyrillic alphabet. It was there so people could spell Greek names both in Cyrillic and in Greek in the same way. But this letter is no longer used today.

In electromagnetism and engineering, uppercase omega (Ω) is used as the symbol for ohms, which are the units of electrical resistance. In physics and other sciences, lowercase omega (ω) is often used to represent angular frequency.

In modern English the phrase "From alpha to omega" expresses the idea of "everything".