In various contexts, twelve has multiple meanings. For example, it is widely used as a measurement of time, as twelve is equal to 1 hour and has been for centuries, divided into 60 minutes, each of 60 seconds. This format is a vestige from the Babylonian era, where it was implemented as a sexagesimal number system.
Additionally, the metric system defines 12 grades for most education systems around the world. Though some exceptions exist, this is the most common number used for primary education.
In many designs and systems, twelve is also used due to its convenience and arithmetic relationships. Examples include time, the calendar system, the standard number of months in a year, the number of counterparts at the top to the base, with copies and staggered candles doubling. For baseball, cricket's cricket teams have 12 players.
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