isocolon

Definitions

noun In rhetoric: A figure which consists in the use of two or more clauses (cola) in immediate succession having the same length or number of syllables. If the equality is only approximate, the figure is properly called parison or parisosis.
noun A period containing successive clauses of equal length.
noun In ancient prosody, a period or system consisting of cola or series of the same length throughout.

noun rhetoric A figure of speech in which parallelism is reinforced by members that are of the same length.

From Ancient Greek ἰσόκωλον, composed of ἴσος (ísos, "equal") and κῶλον (kōlon, "member, clause").

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The parallelism here also employs isocolon, or the repetition of units of equal length of sound: in 'this man's art' and 'that man's scope' the words of the second phrase repeat the monosyllabic length of the first.

Shakespeare Bevington, David 2002
In a passage that brilliantly demonstrates the rhetorical devices we saw earlier in Shakespeare's poetry, such as stichomythia, antithesis, parison, and isocolon (see Chapter 1), Hamlet makes plain that he is on the offensive.

Shakespeare Bevington, David 2002