"Camber angle is the angle made by the wheel of an
automobile; specifically, it is the angle between the vertical
axis of the wheel and the vertical axis of the vehicle when
viewed from the front or rear. It is used in the design of
steering and suspension. If the top of the wheel is further
out than the bottom (that is, away from the axle), it is
called positive camber, if the bottom of the wheel is further
out than the top, it is called negative camber."
courtesy: http://www.answers.com/topic/camber-angle