What is the meaning of Twelve?

NATO, ICAO, ITU & IMO radiotelephony code for 12, used only with o'clock to indicate direction.

The cardinal number occurring after eleven and before thirteen, represented in Arabic numerals as 12 and in Roman numerals as XII.

A group of twelve items.

A twelve-bore gun.

A jury (normally composed of twelve persons).

The police; law enforcement, especially a narcotics officer.

Front (front side of something, position in front of something).

twelve

Source: wiktionary.org