In math, the vertical bar symbol (|) has several uses, depending on the context: In set notation, it's typically seen in expressions like this: {x∣x ∈ R,x > 0} This means "the set of all x such that x is a real number and x is greater than 0 ". As an absolute value symbol, it might be seen in expressions like this: ∣ −3∣.
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