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#
Word	Definition
180	1/2 rotation.
360	One full rotation.
540	A 540 degree rotation in the air. 1/2 rotation more than 360 degrees.
720	Two 360s forward or backward.
900	Two and a half rotations. First landed by Tony Hawk on June 27, 1999, at the X Games.
5-0 grind	Type of grind where just the back truck is grinding.
50/50	Type of grind where both trucks are grinding.

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