https://www.cnet.com/roadshow/news/land-rover-what3words-scottish-island-addresses/

What3words is a mapping company that has come up with a way to establish fairly exact locations without using traditional means of addressing or latitude/longitude coordinates. What it's done is break the entire world down into three-meter by three-meter grid squares and assign each of them a unique series of three words from a dictionary of around 40,000 words with an algorithm choosing simpler words for more populated areas and longer words for more rural areas.

To help solve Mull's emergency services problem, What3words and Land Rover made wooden placards with each dwelling's unique three-word address that can be kept by a telephone and set out to deliver them in a small fleet of Land Rover vehicles which were piloted by Land Rover Experience instructors.