Closed-loop (time)

A closed-loop (also known as a closed-timelike curve) is a time-space continuum distortion that is self-contained, or put basically, is an enclosed infinite loop of time. Such events are only theorised  and rumoured to exist with ancedotal evidence indicating the possibility of existence of CTCs but there's no clear way to demonstrate their existance.

An example of a CTC would be the infinite loop theory.