The Romans did but these letters or numerals represented numbers.
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Roman numerals are numbers that used to be used instead of the numbers today. They are letters that stand for numbers. Examples: III : 3 V : 5 XI : 11 LX : 60
They used numerals because that was the system which they gradually developed over a long period of time. If someone had introduced them to the current system of numbers they would probably have used that instead, they just didn't know about it.
Roman numerals use letters in place of numbers. An unknown variable in algebra uses a letter instead of a number.
Literal numbers are the letters which are used to represent a number.
The type of Mathletics that uses letters instead of numbers is called algebra. Algebra is a branch of mathematics that uses symbols and letters to represent numbers and describe mathematical relationships and operations. It allows for solving equations and expressing patterns and equations in a general form.