Polarization Illustration
Vertical Polarization
Horizontal Polarization
Left Hand Circular Polarization (LHCP),also known as CCW (Counter ClockWise)
Right Hand Circular Polarization (RHCP), also known as CW (ClockWise)

The 4 images are from this site: http://sv1bsx.50webs.com/antenna-pol/polarization.html