The symbols used for counting in math are called numbers, or numerals. They can be whole numbers, or fractions of parts of a number.
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What is a Variable in Math?A variable in math is part of algebra and it is a symbol or letter that represents a number.
The answer is an equal sign =
The symbol that you describe seems to be the greek letter Phi. It is normally used to indicate a variable that is an angle, just as x is used to indicate a variable that is a numeric quantity.
It's called an Interpunct.