XLIII is the Roman numeral representation for the number 43. In the Roman numeral system, "X" stands for 10, "L" represents 50, and "III" signifies 3. Therefore, XLIII is calculated as 50 (L) minus 10 (X) plus 3 (III), resulting in 43. The number 43 has various applications in mathematics and science. It is classified as a prime number, meaning it has no divisors other than 1 and itself. Additionally, 43 is often referenced in popular culture, such as in sports, where it may represent a player's jersey number or a significant event.