curvature vs zig

curvature

noun
  • The shape of something curved. 

  • The extent to which a Riemannian manifold is intrinsically curved. 

  • The extent to which a subspace is curved within a metric space. 

zig

noun
  • A sudden or sharp turn or change of direction. 

verb
  • To make such a turn. 

How often have the words curvature and zig occurred in a corpus of books? (source: Google Ngram Viewer )