Double vertical bar math

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

What does double vertical-line means in linear algebra?

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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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