If you were dreaming of a head, it can mean you have somebody else with you in your journey in life.
If you dream of seeing only the back of a head, and you don’t know the identity of the person, it can mean that person has rejected you.
If you see somebody in your dream turning backwards to look behind, this suggests you should also follow suit. This symbolic turning back can be a message to you to look behind, to watch your back, and look out for events in your environment.