Roman numerals are a system of numerical notation used by the ancient Romans. They are based on combinations of the letters I, V, X, L, C, D, and M, which represent the values 1, 5, 10, 50, 100, 500, and 1000 respectively. The term 'Roman numeral' refers to any of these symbols used to represent numbers. The solutions for the term Roman numeral in this crossword are TRE (3 letters), MLI (3 letters), and SETTE (5 letters). TRE stands for the number 3, MLI stands for the number 1, 000, and SETTE stands for the number 7.