Mathematical figures are symbols or numbers used to represent mathematical concepts. The most common mathematical figures are numerals, which are symbols used to represent numbers. Numerals can be written in various forms, such as Arabic numerals (1, 2, 3, etc.), Roman numerals (I, II, III, etc.), and Chinese numerals (一, 二, 三, etc.). Numerals are used to perform calculations, measure quantities, and express relationships between numbers.