CV boardgame dice
This is a prop from CV board game, in case you lost or broke one of them (heh).
One of my first models, do not expect a perfect quality! There are 2 variants - smooth and sharp, I recommend sharp, as it is way more clear. Smooth version prints better, but it could be hard to read the picture.
Me, myself, I use them as a fast torture test for new filaments (as it could be seen on photo).