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If you are talking about math then its usually " x " but if that is already use in the expression and you want to use another symbol to represent a DIFFERENT number then you can use y or a or so on.
A variable.
The symbols used are called variables.
That is called a variable. A letter is often used.
The choice of a token to represent an unknown is wide open. Commonly, x and y are used, but one may use any letter of the alphabet, particularly if it has some phonic association. c is often used as a token for the speed of light; as a substitute for the word celerity.