A mini ramp is a type of
half-pipe which is typically less than 6ft high. Any ramp smaller than this that is not a
vert ramp is commonly called a mini ramp. Mini ramps can be as small as 2ft in height. While many ramps this size are designed to be forgiving to beginners, some are built more aggressively, providing a steeper ledge for experienced riders to perfect lip tricks. These ramps are appropriate for beginners as well, though they may find it necessary to work their way up from the bottom, as on larger half pipes.
See more at Wikipedia.org...