How about bit.ly link shortening service? If agreed to omit "bit.ly/", then it consists of 7 digits (2YWc9xm) for the entrance door to my office in Finland (http://bit.ly/2YWc9xm), thus replacing https://what3words.com/martini.upstairs.enabling; the nearby another 3 x 3 meters Square is also 7 digits: 31Gg3au (http://bit.ly/31Gg3au), thus replacing https://what3words.com/engaging.applause.recently.

But I like my office addresses to be more humanly-sounding, inviting guests to my place: by "martini upstairs" or "engaging applause" 🙂

For technical guys this discussion is much more interesting, than for average people (like me), enjoying usability of what3words.