The term 'prefix with cycle' refers to a set of prefixes that are used to denote a certain number of cycles. The prefixes UNI (3 letters), TRI (3 letters), EPI (3 letters) and GIGA (4 letters) all refer to a certain number of cycles. UNI stands for one cycle, TRI stands for three cycles, EPI stands for five cycles and GIGA stands for one billion cycles. These prefixes are commonly used in the fields of mathematics, physics and engineering.