A letter. It may be upper or lower case, Roman or Greek alphabet, or indeed from other alphabets.
A variable is a symbol that represents an unknown or changeable number, typically a letter such as x, y, and z.
An unknown number represented by a letter or symbol is a variable.
In Roman numerals, the symbol "V" represents the number 5.
x
Variable.
A variable.
is called a variable or a literal constant, or informally an unknown.
That is called a variable. A letter is often used.
A variable is a symbol that represents an unknown or changeable number, typically a letter such as x, y, and z.
An unknown number represented by a letter or symbol is a variable.
In Roman numerals, the symbol "V" represents the number 5.
x
The symbol that represents forever is the Infinity symbol. The infinity symbol looks like the number 8 laying on its side.
Variable.
The word "variable" represents an unknown number.
The symbol Po-210 represents the isotope of Polonium with a mass number of 210.
variable