Isocolon is a rhetorical scheme in which parallel elements possess the same number of words or syllables. As in any form of parallelism, the pairs or series must enumerate like things to achieve symmetry.[1] The scheme is called bicolon, tricolon, or tetracolon depending on whether they are two, three, or four parallel elements.[2]

Etymology

The term, a compound of ἴσος ísos 'equal' and κῶλον kôlon 'member, clause' was used in the classical Greek rhetorical literature:

pseudo-Demetrius of Phalerum, Περὶ ἑρμηνείας (On Style)[3]

The Greek plural is 'isocola', but 'isocolons' is also used in English.[4]