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See also:  , ǁ [U+01C1 LATIN LETTER LATERAL CLICK], ‖ [U+2016 DOUBLE VERTICAL LINE], ∥ [U+2225 PARALLEL TO], and ⏸ [U+23F8 DOUBLE VERTICAL BAR]

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 (mathematics) Used on either side of an object to denote the norm of that object.
 2002, S. Long et al., A Meshless Local PetrovGalerkin 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 [...]
 (linguistics) delimiter for morphophonemic transcription
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 (mathematics: norm): 