Modulus

Modulus is the diminutive from the Latin word modus meaning measure or manner. It, or its plural moduli, may refer to the following:

Physics, engineering and computing

 * Moduli (physics), scalar fields for which the potential energy function has continuous families of global minima
 * The measurement of standard pitch in the teeth of a rotating gear
 * Bulk modulus, a measure of compression resistance
 * Elastic modulus, a measure of stiffness
 * Shear modulus, a measure of elastic stiffness
 * Young's modulus, a specific elastic modulus
 * Modulo operation (, , etc.), in both math and programming languages; results in remainder of a division
 * Casting modulus used in Chvorinov's rule.

Mathematics

 * Modulus (modular arithmetic), base of modular arithmetic
 * Modulus, the absolute value of a real or complex number ( $|a|$ )
 * Moduli space, in mathematics a geometric space whose points represent algebro-geometric objects
 * Conformal modulus, a measure of the size of a curve family
 * Modulus of continuity, a function gauging the uniform continuity of a function
 * Similarly, the modulus of a Dirichlet character
 * Modulus (algebraic number theory), a formal product of places of a number field
 * The modular function in the theory of Haar measure, often called simply the modulus

Other uses

 * Modulus (gastropod) a genus of small sea snails
 * Modulus Guitars, musical instrument manufacturer
 * Modulus robot, a household robot