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a variable
It is called a variable.
A math expression is a symbol or combination of symbols that represents a quantity or a relationship between quantities.
Oh, dude, in math, a symbol that represents a quantity is called a variable. It's like a mysterious letter that stands in for a number, kinda like a math magician pulling numbers out of a hat. So, next time you see a letter in a math problem, just remember it's not trying to confuse you, it's just playing the math game.
The symbol that represents change is delta. (It looks like a little triangle before the unit) ..../\..... ../....\..... /____\....