12/Historical Note

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Historical Note on $12$ (Twelve)

There are many occurrences of the number $12$ in various cultures in history:

There are $12$ months in a year, divided into $4$ seasons of $3$ months each.
There are $12$ signs of the Zodiac, divided into $3$ sets of $4$ each, and categorising them another way, into $4$ sets of $3$ each.
There are $12$ hours in each day and in each night.
There are $12$ semitones in an octave of a well-tempered scale.
There are $12$ inches in a foot.
There were $12$ pence in $1$ shilling in pre-decimal British coinage.

The word dozen, now falling into disuse, means a set of $12$.

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