In complex analysis, the Omega constant, a solution of Lambert's W function. In differential geometry, the space of differential forms on a manifold (of a certain degree, usually with a superscript). A variable for a 2-dimensional region in calculus, usually corresponding to the domain of a double integral. See more
The lowercase Omega (ω) is used for: Mathematics: The first transfinite ordinal number, often identified with the set of natural numbers including 0 (sometimes written ω 0). In set theory