Can anyone tell me what these markings mean on the back of a bracelet I found? [ENLARGE]

COURTESY OUR FRIENDS: https://i.redd.it/x4fraf6m15d41.jpg via/r/whatisthisthing https://www.reddit.com/r/whatisthisthing/comments/eu7qms/can_anyone_tell_me_what_these_markings_mean_on/?utm_source=ifttt #oddities #weird

The silver part spins freely, and the middle ball is free moving. The bottom of it is open and the whole thing is shallow. [ENLARGE]

https://i.redd.it/uquz8v1o25d41.jpg via/r/whatisthisthing https://www.reddit.com/r/whatisthisthing/comments/eu7t7k/this_thing_the_silver_part_spins_freely_and_the/?utm_source=ifttt #oddities #weird

These are the thoughts that keep me up at night.