Divination or fortune-telling using numbers, similar to numerology.
From Greek arithmos ('number') + manteia ('divination'). It's related to other -mancy words like 'necromancy' (divination by the dead) and 'geomancy' (divination by earth).
Arithmomancy reveals how ancient people saw magic in mathematics—they believed numbers could predict the future, much like modern people obsess over lucky numbers and personal numerology.
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