Reminds me of a similar setup I had in the basement of the apartment building I lived in: there were groups of valves on the water pipes running along the ceiling, and on each handle there was a tag with apartment numbers written on it.

This was essentially use-case organization, because the use case was, "in case of a leak upstream of your in-apartment valve, go to the basement, find the valve that controls the line you're attached to, shut it off, and go inform other people on the same line what's going on".