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Q: A letter or symbol that is represent by unknown number?

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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.

A variable.

mnemonic * * * * * A variable

A variablẹ

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.

a variable

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

fog

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.

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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.