The pnp game, Tack (https://boardgamegeek.com/boardgame/305212/tack), needs markers to determine the score and who's ahead. I could have used boring cubes, but I decided instead to make a tiny (25mm) sailboat in TinkerCad.

The boat comes in two pieces, so you can print the sail in a different color like I did. The hole for the mast should be sufficient to not require any filing or glue. Of course, your mileage may vary.

Obviously, this model can be used anywhere a tiny boat is needed. I'd love to hear your uses for it.