Yes since a number and a variable and a number are a symbol.
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variable
1(: if the variable is not given to you
The same as in many other expressions. It is a variable, that is, it can be replaced by any number.
x+5, but the x can be replaced with any variable (i.e. letter)
n will typically mean number. It can stand for any given number, and what it stands for will depend on the problem.