The usual symbol for a pound Sterling had two cross lines when the amount was handwitten, but the keyboards of computers (and the modern banknotes) only use one cross line.
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A dollar sign has TWO lines going through it. The one on your keyboard IS NOT the dollar sign, it is another symbol called an "OFFSET" .
If you are asking what are perpindicular lines, they are two lines that cross to form right angles, or 90 degree angles. An example of this is a plus sign (+). The two lines forming the plus sign are perpindicular to each other.
Its called an intersection (LOOK ---> +
Two lines can lie in one plane. For example, parallel lines are lines that intersect and lie in the same plane.
Two pairs of vertical angle formed by intersecting lines is a plus sign or an x. something that looks like this, but with the lines completely touching: +x