Reuleaux Triangle

A few days ago, I heard about the Reuleaux Triangle. This triangle has the unique feature that if you rotate it with a flat surface on it, it remains stable in height, although its central axis does vary, unlike the wheel.

Furthermore, this triangle on a drill bit allows you to make square holes with a drill.

Here's my Reuleaux Triangle, with which you can test these interesting facts.

What would you use this triangle for? Leave it in the comments.