The number twelve carries religious, mythological and magical symbolism, generally representing perfection, entirety, or cosmic order in traditions since antiquity.
Historically, units of time in many civilizations are duodecimal. There are twelve signs of the zodiac , twelve months in a year, and the Babylonians had twelve hours in a day (although at some point, this was changed to 24). Traditional Chinese calendars , clocks, and compasses are based on the twelve Earthly Branches or 24 (12×2) Solar terms . There are 12 inches in an imperial foot, 12 troy ounces in a troy pound, 24 (12×2) hours in a day; many other items are counted by the dozen , gross (144, twelve squared ), or great gross (1728, twelve cubed ). The Romans used a fraction system based on 12, including the uncia , which became both the English words ounce and inch . Historically, many parts of western Europe used a mixed vigesimal –duodecimal currency system of pounds, shillings, and pence , with 20 shillings to a pound and 12 pence to a shilling, originally established by Charlemagne in the 780s.
Le tableau ci-dessous vous permettra de consulter la correspondance pouce centimètre pour des longueurs allant de 12 à 12,95 pouces (incrémentation de ).
En anglais , l'étymologie (Weekley, Skeat) suggère que « twelve » (similaire à « eleven ») est constitué de deux parties, la première voulant dire « two » (deux) et la seconde « leftover » (reste), donc une traduction littérale voudrait dire « deux restants (après avoir pris dix) ».
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