I am thinking of making some wooden cases for various tools, parts and so on. In some ways they are baby cousins of (and inspired by) printers' type cases.
Some type cases have brass "caps" on the joins between horizontal and vertical separators. These come in "cross" shapes, "tee" shapes and also sometimes "L" shapes for outer corners.
They seem like a good way to avoid the internal walls coming adrift as they hold the top corners firmly together. There are other ways like setting in grooves, but this way seems a lot more flexible (no extra cutting or routing) if you can just drop walls in with a bit of PVA, and cap with one of these at each end.
I have found several kinds of "corner protectors" for sale, but not this kind of reinforcement. Is it something that a) has a name and b) can be bought these days?