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.
A variable
x or any other variable
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.
A variablẹ
A variable
It is called a variable.
It is called a variable.
Variable
x or any other variable
variable
a variable
In maths the symbols x and n are usually used to represent an unknown quantity. These may be referred to as a variable.
An elipsis or * * * is used to present a change of scene.
The "s" on top of an "s" symbol is typically used in mathematics to represent integration and is called the integral symbol. It is used to denote the process of finding the area under a curve or the accumulation of a quantity over an interval.
X is the symbol for multiplication, as in 2X2=4 X (or any other letter) is often used to represent an unknown quantity.
A God's symbol is what is used to represent them.