An unknown number represented by a letter or symbol is a variable.
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.
mnemonic * * * * * A variable
The symbols used are called variables.
Variable: A letter or symbol used to represent a number or quantities that vary
it is any letter or mathematical symbol that represent a number or a set of number
It is called a variable
That is called a variable. A letter is often used.
In math a letter is a variable and it can be any number.
the symbol scientists use to represent the atomic mass number is the letter U.
X and y
An unknown number is a variable and its symbol is usually in the form of a letter such as x or y
the def for variable is a letter or symbol used to represent a missing number in an algebrac expression
It is a variable
A variable is a symbol that represents an unknown or changeable number, typically a letter such as x, y, and z.
The Roman Numeral symbol for 500 is the letter D. You would represent the number 510 as DX.
the letter J
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.