Isocolon

i-so-co'-lon / From Greek: isos, "equal" and kolon, "member"
Also known as: compar, conpar, parison, the figure of even

A series of similarly structured elements having the same length. A kind of parallelism.

Examples:

Veni, vidi, vici (I came, I saw, I conquered)
Note: This example also demonstrates asyndeton, tricolon, and (in the Latin), alliteration and homoioptoton.