There is no specific number of symbols that can be used. You can use any letter of any alphabet.
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A number by itself is meaningless. Symbols and labels add meaning in math. Symbols in math are used to represent different operations, and/or add descriptions. There are many different symbols each which have their own purpose. Some symbols have different purposes in different types of math.
There are 16 symbols. The number of symbols is always the same as the base.
101
They used cuneiform numbers.
Well- by numbers, obviously! However, some numbers can be expressed in maths via equations or combinations of different numbers that have to be calculated to reveal what the number actually is. It's a bit like a code-cracking game. Mathematics also uses a whole range of symbols that each have a meaning, to cut down on the use of words as a means of expression and save space- many of these symbols were devised in ancient Greece by the mathematical scholars there.