"XXXI" is the Roman numeral representation for the number 31. In the context of numbers, it follows 30 and precedes 32. Roman numerals are a numeral system originating from ancient Rome, using combinations of letters from the Latin alphabet. In various cultures, the number 31 can hold significance. For example, in the Gregorian calendar, October has 31 days, making it notable for events like Halloween. Additionally, in sports, the number 31 can represent a player's jersey number or a specific statistic, depending on the context.