'tetragon' originates from Greek, specifically the word 'tetragōnon', where 'tetra-' meant 'four' and 'gōnia' meant 'angle'.

'tetragōnon' transformed into the Latin word 'tetragonum', and eventually became the modern English word 'tetragon'.

Initially, it meant 'four angles', and this meaning has largely remained the same in modern usage.