The cardinal numeral is a type of number that represents a quantity. There are various synonyms for this term such as cardinal, digit, figure, integer, number, and numeral. These terms are often used interchangeably to describe the same concept. The word cardinal is derived from the Latin word "cardo," which means hinge or pivot, and it signifies the fundamental importance of these numbers in mathematics. The term digit refers to a single numeral in a larger number, while figure is often used to refer to numbers in a more general sense. Integer is a term used in mathematics to describe whole numbers, while number and numeral are general terms that can refer to any type of numerical representation.