Or in Shavian, 𐑒𐑢𐑲𐑼

Huh, I had no idea that was the case. How does what3words make money exactly? I assume ads but I block those everywhere I use a screen.

Are there any services that do roughly the same thing but are open source?

The what3words app is awesome and lets you share any 10-foot square on the planet and save them into lists.