You can use any letter as a variable, although they can get confused with symbols like t with +, i with imaginary, and x with multiplication.
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an independent variable is a figure usually shown as a letter that is used in the scientific theory. An independent variable is used in a hypothesized experiment in which this variable is unchanged and is used to effect the dependent variable somewhere in the experiment.
Variable: A letter or symbol used to represent a number or quantities that vary
The letter x.
You could say, "Today in our science experiment we had to figure out what the dependent variable was"
The letter x.