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12 (twelve)
One of the most widely used numbers is 12. You can also call it a dozen.
Explanation
We all know that a year has 12 months. On a clock 12 hours are shown. There were 12 apostles.
Is this all coincidence?
Of course not. A dozen (12) or a gros (144) make really sense. Just look at (2 × 12 = 24) or (5 × 12 = 60) and (12 × 12 = 144).
The numeral system in which you calculate makes no difference, you can divide the number 12 in many ways, and that is so important.