**How to Do a Straight Vertical Line on a Keyboard | …**
https://www.techwalla.com/articles/how-to-do-a-straight-vertical-line-on-a-keyboard

Nov 30, 2018 · A straight vertical line can be used in mathematics to represent the absolute value of a number, meaning its distance from zero. For example, the absolute value of -5, written |-5|, is simply 5. The absolute value of positive 5, or |5|, is also 5.

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