# Modulus

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**Modulus** is the [diminutive](/source/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)](/source/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](/source/Gear#Standard_pitches_and_the_module_system)
- [Bulk modulus](/source/Bulk_modulus), a measure of compression resistance
- [Elastic modulus](/source/Elastic_modulus), a measure of stiffness
- [Shear modulus](/source/Shear_modulus), a measure of elastic stiffness
- [Young's modulus](/source/Young's_modulus), a specific elastic modulus
- [Modulo operation](/source/Modulo_operation) (a % b, mod(a, b), etc.), in both math and programming languages; results in remainder of a division
- Casting modulus used in [Chvorinov's rule](/source/Chvorinov's_rule).

## Mathematics

- Modulus, the [absolute value](/source/Absolute_value) of a real or complex number ( )
- [Modulus (modular arithmetic)](/source/Modulus_(modular_arithmetic)), base of modular arithmetic
- Similarly, the modulus of a [Dirichlet character](/source/Dirichlet_character)
- [Moduli space](/source/Moduli_space), in mathematics a geometric space whose points represent algebro-geometric objects
- [Conformal modulus](/source/Conformal_modulus), a measure of the size of a curve family
- [Modulus of continuity](/source/Modulus_of_continuity), a function gauging the uniform continuity of a function
- Similarly, [modulus of convergence](/source/Modulus_of_convergence)
- [Modulus (algebraic number theory)](/source/Modulus_(algebraic_number_theory)), a formal product of places of a number field
- [The modular function in the theory of Haar measure](/source/Haar_measure#The_modular_function), often called simply the modulus

## Other uses

- [*Modulus* (gastropod)](/source/Modulus_(gastropod)) a genus of small sea snails
- [Modulus Guitars](/source/Modulus_Guitars), musical instrument manufacturer
- [Modulus robot](/source/Modulus_robot), a household robot

## See also

- [Module (disambiguation)](/source/Module_(disambiguation))
- [Modulo (disambiguation)](/source/Modulo_(disambiguation))

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Adapted from the Wikipedia article [Modulus](https://en.wikipedia.org/wiki/Modulus) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Modulus?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.