Infinity is a mathematical concept that represents a quantity that is larger than any number that can be represented in the calculator. In some calculators, you can represent infinity using the symbol "โ" or "INF". When you try to divide a number by zero, the calculator may display "Error" or "Undefined" or "โ" to indicate that the result is infinity. However, it is important to note that infinity is not a real number and cannot be included in mathematical calculations like addition or multiplication.