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It means "absolute value".....it represents [in general]  the distance a number is from 0 on the number line.....

For instance:   abs(3)  = 3      and also,  abs(-3)  = 3

Since distance is always positive, then  abs(n)  is always positive....

Is that a math term I don't know about or...........

That's cool!!!

Thanks! That is cool! B.T.W. I've seen it as: |n|, for example as yours it is also |3| = 3

|-3| = 3