Planes

The way that you hold your hand while playing, and direction that you sling your beads is considered the "plane" that you are in. There are 3 primary planes. Other planes exist, but they are not named and usually only used for trick transitions.

Bike Plane
This is the most popular plane. You palm is facing your body. The beads are swinging in an up-and-down motion.

Wall Plane
The palm is facing "the wall" (to the left or right, depending on which hand). The beads are swinging in a side-to-side motion.

Floor Plane (0g)
The palm is facing the floor or ceiling. Commonly called 0g in balisong and other skill toys, slinging in floor plane is a fight against gravity.