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‖	U+2016, ‖ DOUBLE VERTICAL LINE

General Punctuation

Translingual

(mathematics) Used on either side of an object to denote the norm of that object.
$||(4,3)||=5$
- 2002, S. Long et al., A Meshless Local Petrov-Galerkin Method for Solving the Bending Problem of a Thin Plate, Tech Science Press
  For the purpose of error estimation and convergence studies, the deflection and energy norm, ||w|| and ||e||, are calculated [...]

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