The story
- Ancient Greek · borrowed fromτετρακτύς
- English todaytetractys
Borrowed from Ancient Greek τετρακτύς (tetraktús).
Etymology from Wiktionary, CC BY-SA 4.0.
tetractys
Today it means: A triangular figure consisting of ten points arranged in four rows, representing the fourth triangular number and having mystical significance to the Pythagoreans. Full definition →
Ancient Greek τετρακτύς