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Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   norm
      <mathematics> A real-valued function modelling the length of
      a vector.  The norm must be homogeneous and symmetric
      and fulfil the following condition: the shortest way to reach
      a point is to go straight toward it.  Every convex symmetric
      closed surface surrounding point 0 introduces a norm by
      means of Minkowski functional; all vectors that end on the
      surface have the same norm then.
      The most popular norm is the Euclidean norm.
      (2004-02-15)