I'm kind of stuck on some problems with a variable that looks like this |x|

Can someone tell me what those two lines are for? Thanks (Thinking)

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- October 20th 2009, 04:18 PMJubblyQuick question
I'm kind of stuck on some problems with a variable that looks like this |x|

Can someone tell me what those two lines are for? Thanks (Thinking) - October 20th 2009, 04:20 PMmr fantastic