It's not a real number, it is an expression that means somewhere between 13 and 19 of whatever you are discussing.
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Does a 'zillion' really exist? I thought it was just an expression, like 'umpteen'.
* innumerable * many * infinite * multitudinous * untold * a plethora of * a slew * umpteen * oodles * limitless * legion of * incalculable * a vast array
For school trigonometry, it is used to find the angles of a triangle when only the lengths of the sides are known.Later on, in mechanics, you may come across the decomposition of forces along and across the line of motion. In calculus you may come across it in second order differential equations.
Yes, and no. Gillion, or jillion, or zillion, are all vague numbers meaning a very large number too large to calculate accurately. Vague numbers are very useful for indicating an approximate amount. Umpteen is a vague number meaning more than ten, less than twenty. "A couple", which originally meant "two", as in two people being called a couple, is also used as a vague number meaning two-ish, in "Give me a couple of grapes."
Infinitely many. Infinitely many. Infinitely many. Infinitely many.