A letter used to represent a number is a variable of sometimes a constant.
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Variable
A letter used to represent a number is called a variable. Typically, the letters x and y are used, but technically you can use any letter of the alphabet.
The number 11, (in hexadecimal) is the letter 'b'
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A variable
a variable
a variable.
Variable: A letter or symbol used to represent a number or quantities that vary
It is called a variable
I only need to know the one or two letter designation used to represent the name of an element