What is the intuition behind all three keys inside action?

In the below function , what does world_vector , rotation_delta , gripper_closedness_action mean ??

def step_map_fn(step):
return {
'observation': {
'image': tf.image.resize(step['observation']['image'], (128, 128)),
},
'action': tf.concat([
step['action']['world_vector'],
step['action']['rotation_delta'],
step['action']['gripper_closedness_action'],
], axis=-1)
}