Aka "robbies". Very common in Canada for carpentry & woodworking and electrical boxes & wiring devices. I use a robbie most of the time, occasionally a phillips and almost never a flat blade. Most of my flat blade screwdrivers have ended up being damaged from being used as a chisel. My old Bosch impact driver along with a square bit has thousands of miles on it for carpentry use. Phillips screws are used mostly for finish appearance on exposed heads. Drywall screws here are always phillips.
Handles are usually color coded (at least here). A robbie red would be a #2 bit and green a #1. Robertson decking screws require a different bit that have a 3 degree taper.
I would have thought that the US would have been the same? If not, what is used for things like yellow zinc construction screws and coated decking screws?
Trivia: the robertson screwdriver was invented in 1908 by a Canadian, P.L. Robertson.