I work for an institution and our abbreviated name ends in C. So my Johnny.decimal system for work has long been my XXCodex.
My system for everything else in my life is my lifeadmindex.
Together, I think of these things as my prosthetic memory. it’s impossible to remember all the details of where I store stuff or even whether I may have started on something long ago (took notes, collected resources, etc) but abandoned it. It’s not impossible to remember to check my prosthetic memory for relevant things to whatever I’m doing right now.