That is called a variable. A letter is often used.
is called a variable or a literal constant, or informally an unknown.
b
X
Is called a variable and is represented by and letter
That is called a variable. A letter is often used.
An unknown number represented by a letter or symbol is a variable.
A variable is a symbol that represents an unknown or changeable number, typically a letter such as x, y, and z.
A letter. It may be upper or lower case, Roman or Greek alphabet, or indeed from other alphabets.
variable
Variable.
is called a variable or a literal constant, or informally an unknown.
b
a variable
It is a variable and is expressed as a letter as for example it could be x or y
X
Is called a variable and is represented by and letter