Definition
LXXXIV represents the number 84 in Roman numerals. 'L' stands for 50, 'XXX' represents 30 (10+10+10), and 'IV' represents 4 (5-1). Putting them together, we get 50 + 30 + 4 = 84. It uses both additive and subtractive principles. It's a compact way of writing numbers that looks different from what we are used to.