Hmm. Don't know for certain about the notation in this specific context, but the |w| would mean the absolute value of w in the only context I've come across it before. That is to say take your value of w and get rid of any minus sign if there is one.
if w=x; |w|=x
if w=-x; |w|=x
easy
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"No one was behaving from very Buddhist motives. Then, thought Pigsy, he was hardly a Buddha, nor was he a monkey. Presently, he was a pig spirit changed into a little girl pretending to be a little boy to be offered to a water monster. It was all very simple to a pig spirit."
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