A symbol, usually a letter, that is used to represent 1 or more numbers
That's called a variable.
A letter used to represent numbers is called a variable; the most common ones are 'x' and 'y'.
a letter or symbol that stands for one or more numbers is a
it is called a variable not a letter
put a line on top of the number for example a line on top of second number its easy
A variable. In computer programming, you can have a single variable for a group of related numbers - in this case, you speak about an array.
It is a variable