Norm

The word norm coming from the latin word norma which means "angle measure" or (lawlike) "rule", has a number of meanings:

A social or sociological norm, see norm (sociology).
A statistical concept in psychometrics.
In mathematics, a norm can be
- A map which assigns a length to vectors, see normed vector space. See also matrix norm.
- The nonnegative integer function in the definition of Euclidean domain;
- The product of conjugate elements of an algebraic element;
- The field norm in algebraic number theory and Galois theory.
- The reduced norm in the theory of algebras.
Norm is also a character in the sitcom "Cheers".
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See related meanings in normal.

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