It stands for the magnifying unit.
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maybe its a multiplication .
200x and 860x
x to the n divided by x to the n is 1. By the law of powers x to the power n divided by x to the power n is x to the power (n minus n), ie x to the power zero. Things which are equal to the same thing are equal to each other. Therefore x to the power zero = 1. (Unless x = zero!)
5^3 = 5 x 5 x 5
x to the power 2 = (x to the power 3)/x; x to the power 1 = (x to the power 2)/x; x to the power 0 = (x to the power 1)/x. As x to the power 1 is merely x then the last expression is equivalent to x/x, ie 1.