They're called "Madison Clips" where I am - (no idea why) Long Island, NY. I think the "official" name is box supports. I guess they've been around for awhile. During a remodel I came across some that an old timer had made from a coffee can many years ago.

Hey, maybe we should start a list going and catalog some of these terms for posterity. You can think about it while you're at lunch eating your "Grinder" -
or is it a "Hero",
"Hoagie"
"Sub"
???
[Linked Image]

Bill