Can someone explain what "Bed Peace, Hair Peace" means?

Question

I know its from that picture of John Lennon and Yoko Ono, but what does it mean, or what do the signs signify?

http://i58.photobucket.com/albums/g263/EarthForceUnited/BedHairPeaceJohnandYoko.jpg

Answer 1

It signified the War is over peace message around the world...

I.E Just like Bagism peace

Answer 2

World Peace...

Hippies :o)