It is a training task set for 6 DOF (degree-of-freedom) robot arms.
https://github.com/rlworkgroup/metaworld
Here’s a 38MB gif explaining it: https://meta-world.github.io/figures/ml45-1080p.gif
“Meta-World is an open-source simulated benchmark for meta-reinforcement learning and multi-task learning consisting of 50 distinct robotic manipulation tasks. We aim to provide task distributions that are sufficiently broad to evaluate meta-RL algorithms’ generalization ability to new behaviors.”