What is the definition Of digit in math?

In mathematics, a digit is a single numeric symbol used to represent numbers in a positional numeral system. The most common system, the decimal system, uses ten digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. Each digit's position in a number determines its value. For example, in the number 345, the digit '3' represents three hundreds, '4' represents four tens, and '5' represents five units.