Factory is an asymmetrical trick with a rhythm that can be tricky to pick up, but crowds love it. It has a few different names including the "factory", "the machine", and "the robot" that it gets from its mechanical carrying motion.
If you want to learn more about factories, machines, or robots, check out the wikipedia page here:
The rhythm can feel a little strange when you're learning. If you're having trouble, try counting "one-two-three" or "lift-cross-drop" while you practice.
Additional notes: This is an asymmetrical trick. Try to learn it going both directions.