variable
It is called a variable.
No, there is not.
The symbols used are called variables.
If you are talking about math then its usually " x " but if that is already use in the expression and you want to use another symbol to represent a DIFFERENT number then you can use y or a or so on.
The letter symbol sometimes used to represent 'e' is the Greek letter epsilon (ε). In mathematics and various scientific fields, particularly in calculus and statistics, epsilon is often used to denote a small positive quantity or error margin.
A variable
a variable
It is called a variable.
An elipsis or * * * is used to present a change of scene.
It is called a variable.
The symbol used to represent change in an equation is Δ (delta). It indicates the difference or change between two values.
The symbol used to represent the word "which" is typically "?".
The symbol used in music to represent a rest is called a "rest symbol."
The triangle symbol that means change is called the delta symbol. It is commonly used in mathematics and science to represent a change in quantity or variable.
The symbol used to represent a nucleus is "Au", which is a combination of the atomic symbol and mass number.
Glucose can be written as C6H12O6.
The symbol that is used to represent a joule is the letter "J". This is a derived unit of energy. It can also be used to represent work, and an amount of heat.