Pan
Pan turns up in 2 fields: concrete, woodworking. Here is what it means to the people in each one.
Pan in concrete
A round steel float disc clipped onto a power trowel's blades for the first, flattening machine passes.
Float pans sit under the trowel blades and spread the machine's weight, so finishers can get on a slab earlier than bare blades allow. Panning cuts down high spots, fills lows and pulls up paste, and on flatness-critical floors it is what produces high FF numbers. Crews use it as a verb too: pan it, double-pan it, get the pans on.
"North end will take the pans now, do two passes crosswise and then switch to combo blades."
Pan in woodworking
A shallow recess cut into a door or frame to seat a hinge leaf flush with the surface.
The mortised depression chopped or routed into wood to receive the leaf of a hinge. Sinking the hinge into the pan allows the two wooden surfaces to close tightly without the metal hardware holding them apart. The depth of the pan must perfectly match the thickness of the hinge leaf to prevent the door from binding.
"Clean out the corners of the pan with a chisel so the butt hinge sits dead flat."