"XVI" is the Roman numeral representation for the number 16. Roman numerals are a numeral system originating from ancient Rome, using combinations of letters from the Latin alphabet. In this system, "X" stands for 10, "V" for 5, and "I" for 1. Therefore, when combined, "XVI" equals 10 + 5 + 1 = 16. The number 16 has various significance in different contexts. For example, in mathematics, it is a square number, as it is the result of 4 multiplied by itself (4 x 4). Additionally, in music, a common time signature is 4/4, which can be divided into 16 beats.