Repeating digits refer to numbers that contain the same digit appearing more than once in their sequence. For example, in the number 1223, the digit 2 repeats. This concept is often observed in various numerical contexts, such as in phone numbers, license plates, and even in mathematical patterns. In mathematics, repeating digits can influence calculations and properties of numbers. For instance, a number like 111 is considered a repdigit, which is a number made up of repeated instances of the same digit. Understanding repeating digits can be useful in number theory and combinatorics, where patterns and sequences are analyzed.