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1 Conformal modulus, a measure of the size of a curve family. 2  Modulus of continuity, a function gauging the uniform continuity of a function. 3  Modular arithmetic, the modulus being the value at which numbers wrap around.  Similarly, the modulus of a Dirichlet character.
From Wikipedia, the free encyclopedia. In mathematics, an annulus (the Latin word for little ring, with plural annuli) is a ring-shaped object, especially a region bounded by two concentric circles.