Yes, I remember using "shelves" a lot. The branch was created for a major refactor of the code base, and the team I was on moved to that branch. Not sure what happened to it. I hated that company and left after a few months.
I wonder if it’s a workplace I worked at. We ended up having a bunch of generic branch names (one org had colors, another had star-related things), and when a project was done, they just used that branch for something else.