Numeral

A numeral is a symbol or a string of symbols used to represent a number. For example, the decimal numeral consists of the two decimal digits and , but represents a single number. The Arabic numerals 0-9 are the most commonly used digits today. Other types, mainly of historical interest, include Egyptian numerals, Babylonian numerals, Mayan numerals, Greek numerals, and Roman numerals.

Numerals also appear in the proof of Gödel's undecidability theorem in the form of his "Zahlzeichen" ("number-sign").