A simple status tracker or counter dial.  It consists of two pieces held together with magnets, so the top piece spins to line up different numbers with the cutout window.  Use it to count actions, or health, or some other status.  Here are some additional features of this particular model:

• Large numbers for readabilty.

• Eleven positions: 0-9 + *

• Flat sides (hendecagon) and various indents for better ergonomics.

• Inner bumps/divets help the dial snap to each position.

• Use a filiment swap or other color change to add contrast for readability.

FreeCad file included for easy editing.  The inner bumps might be a bit too big, so either either resize them in the FreeCad file, or (what I did) shave them down to just the right size after printing.