Backward Long Jump (BLJ) - Conserves backward momentum in order to launch you across large areas of land. Very useful for lava skips.
Animation Skip - If you are damaged while in the middle of doing an animation it will end the animation and play the damage animation. Can be used to quickly climb ledges.
Hitbox Launch - If you jump on an enemy's hitbox while jumping backward your hitboxes will collide and you will be launched very far backward.
Out of Bounds (OOB) - If you go out of the normal bounds of the map this is considered out of bounds.
Bring item from one save into another - Be in the save that you want to bring the item from. Put your item in your offhand (equip it then hide it). Now load your desired save and open your inventory and press equip and it will be in your inventory.