it's called a 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.
The symbols used are called variables.
A polygon with an unknown number of sides is called a n-gon. The letter "N" in n-gon stands for unknown.
An unknown number represented by a letter or symbol is a variable.
it's called a variable (:
a variable.
The unknown or the variable
X is an unknown number.
is called a variable or a literal constant, or informally an unknown.
That is called a variable. A letter is often used.
Anagram. There is no separate term.
It's called a Pro numeral.
Four times the unknown number. Let's say the unknown number is x. x + 3x = 4x
An unknown number is a variable and its symbol is usually in the form of a letter such as x or y