# 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 $12$ 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 were $12$ pence in $1$ shilling in pre-decimal British coinage.

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

## Also see

## Sources

- 1986: David Wells:
*Curious and Interesting Numbers*... (previous) ... (next): $12$ - 1997: David Wells:
*Curious and Interesting Numbers*(2nd ed.) ... (previous) ... (next): $12$