Plural of hexad; groups or sets of six things, or in chemistry, elements or radicals with a valence of six.
From Greek 'hexad' (group of six) derived from 'hex' (six) and the suffix '-ad' meaning a collection or group. The term has been used since ancient times to describe sets of six.
In ancient Greek philosophy, hexads were considered mystically significant—Pythagoras and his followers believed that six was a 'perfect number' because its divisors (1, 2, 3) add up to exactly six, a property that fascinated mathematicians for over 2,000 years.
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