A variable
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x or any other variable
In mathematics, a symbol that represents an unknown quantity is typically denoted by a variable, such as "x" or "y". These variables are used to represent values that are not yet known or are subject to change. They are commonly used in algebraic equations to solve for the unknown quantity based on given information or conditions.
In maths most vairables are represented with letters. EG. A+B=C So for a best guest and in this case i would say X would be the best for an unknown variable that could change, as x is normally associated with many unknowns.
Unknonwn quantity is any variable a,b,c or x,y
Delta as a mathematical symbol usually means "change". It's usually used the same way in physics and chemistry, though it's sometimes used in chemical equations to represent heat.