Double Vertical Bar ‖ symbol is used to represent norms in mathematics, (for example ). It can also be used to signify parallel lines. It can also be used to signify parallel
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Vertical bar
The double bar symbol | is used to denote certain kinds of norms in mathematics (e.g., ||x|| or ||x||_2). It is also used to denote parallel lines, as in A∥B, and in an older notation for
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