ok guys, im having trouble with this problem

this is due very soon

this was the question given

Identify a function that is naturally periodic (not a horizontal line or one that involves trig functions).

Identify the period.

Graph the function.

what does it mean by naturally periodic? maybe i can do it if i know what it means, also how do i figure out a period of a regular function? i only know how to do it to trig functions

any help is appreciated, thanks