# Numerical digit

## Symbols used to write numbers / From Wikipedia, the free encyclopedia

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A **numerical digit** (often shortened to just **digit**) or **numeral** is a single symbol used alone (such as "1") or in combinations (such as "15"), to represent numbers in a positional numeral system. The name "digit" comes from the fact that the ten digits (Latin *digiti* meaning fingers)^{[1]} of the hands correspond to the ten symbols of the common base 10 numeral system, i.e. the decimal (ancient Latin adjective *decem* meaning ten)^{[2]} digits.

For a given numeral system with an integer base, the number of different digits required is given by the absolute value of the base. For example, the decimal system (base 10) requires ten digits (0 through to 9), whereas the binary system (base 2) requires two digits (0 and 1).