lots of greekish letters are used in formulas. Other than them, there's always +, -, /, and x.
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number
It was the invention and usage of a zero symbol
It is Z from the German for "to count". The counting, or natural numbers are denoted by N.
He used "aleph", the first letter of the Hebrew alphabet, which looks like this: א
The king was in the counting house counting all his money.