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number
lots of greekish letters are used in formulas. Other than them, there's always +, -, /, and x.
A number is an arithmetical value, expressed by a word, symbol, or figure, representing a particular quantity and used in counting and making calculations. To keep it more simple you can describe it as a quantity or amount.
Yes, whole numbers are counting numbers.The term whole number does not have a consistent definition.Well the most used definition is "counting numbers along with zero".
He used "aleph", the first letter of the Hebrew alphabet, which looks like this: א