Simple Low-resolution Projector Parts If You Had To Represent The Action Of "synchronizing" With A Simple Symbol Or Icon?

If you had to represent the action of "synchronizing" with a simple symbol or Icon? - simple low-resolution projector parts

If I the action of the "sync" with a simple symbol or an icon representing what would it be? I understand the user interface of a program of work, and I need ideas. Note that you should simply use and easy to make devices with low resolution.