In physics, the Omega symbol (Ω or ω) is used to represent the twenty-fourth and last letter in the Greek alphabet. It can also be used to denote Angular velocity or Omega particle. In mathematics, it is often used to represent an infinite number.
The symbol Ω was first introduced in 1748 by Leonhard Euler. He used it to represent a constant in a differential equation that he was working on at the time. The specific constant that Euler chose was later shown to be equal to 2π, but this did not deter him from using Ω in other equations as well.
Today, Ω is widely recognized as a mathematical symbol and has many uses beyond physics and engineering. In set theory, for example, it denotes an ordinal number; in complex analysis, it represents the imaginary unit, and in logic, it stands for an assertion operator.