The Cheth represents a binding with God like in a marriage relationship. It is a picture of the chuppah or marriage copy which is to picture a portal that the couple walks through to enter a new life where you are no longer the center of your world but it now it revolves around person. The Jews in ancient times called it being born again.

This is just like accepting Jesus we pass through a Cheth or portal in a marriage relationship where the Cheth binds us to Jesus as a marriage partner and we are born again.