one more than twenty-two; denoting a quantity consisting of twenty-three items or units; -- representing the number twenty-three as Arabic numerals
the cardinal number that is the sum of twenty-two and one
being three more than twenty
It is the smallest natural number with an eleven letter name in English.
The "23 Enigma" refers to the Discordian belief that all incidents and events are directly connected to the number 23, some permutation of the number 23, or a number related to the number 23, given enough ingenuity on the part of the interpreter.