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Use a ruler to measure the line (horizontal?) and mark the middle of the line, then use a right-angle triangle to draw a vertical line 90 degrees from the mark. Or you can use a compass fitted with a pencil to draw arcs that will give the middle mark and a mark to line a ruler against to draw the perpendicular line required. Search Google for using a compass.
Yes. If you mark the odd numbers in Pascal's Triangle, it would form Sierpinski's Gasket.
Yes, they do exist. Just sticking a question mark at the end of a phrase is not a particularly sensible way of asking a question!
Do you mean an exclaimation mark (!) An exclamination mark means factorial so............. 3! = 3 factorial 3 factorial means 1x2x3 = 6 2! or 2 factorial means 1x2 = 2 4! or 4 factorial means 1x2x3x4 = 24
There are no design varieties. However, there were 6 different mint mark punches used over the years. There is a detailed explanation at the site under Related Links, below.