Shimano Center-Lock Disc Shimano Micro Spline Bicycle Rear Hubs
About Shimano - "Shimano practices good local citizenship, pursues continued access to those areas that are enjoyed by outdoor enthusiasts, and is committed to minimizing our impact on the environment."
This should correspond to the type of brakes you have on the bike.
The cassette body type is the type of cassette and number of speeds the hub will accept.