My camera turned invisible It might be a dumb question but I didn't find the answer anywhere on the internet.

I really don't understand why my camera is all of a sudden invisible in my scene. I know it is there when I push Numpad 0 it goes to the cameras view but when I push it again and go back into the scene its gone along with the center point. So far I have only tried Alt + H. 

The camera is selected here but I cant see the black outlining
In the 3D View properties region N key, to the right of the screen, you ticked the option Only Render (visible in your screenshot).

This makes only visible objects with actual renderable geometry visible in the viewport. The camera object, being an abstraction of a virtual object not visible in a final image, becomes hidden away.