How to read Scottish buildings is a sizeable book by Daniel MacCannell. I don’t think the method has anything to do with sandstone braille.
In the early nineties, Herb Miller led a product development project code named Silver Bullet. The team started collecting pairs of words where the first started with an S and the second with a B. This website is the continuation of that part of the project. Nowadays other projects display alternatives to their official acronyms on their websites.