Tricolon

tri-co'-lon / From Greek: tri, "three" and kolon, "clause"

Three parallel elements of the same length occurring together in a series.

 Example:

Veni, vidi, vici. —Julius Caesar
("I came; I saw; I conquered." However, the English is not a true tricolon, for its verbs are not all the same length, as is the case in the Latin)