It is a jib or fore sail that has a slot cut into it.
Turning slotted head screws.
For driving flat head or slotted screws in, or removing them.
Power drivers slip with slotted screws. They usually use Phillips head screws.
A lapper sail is a head sail (jib) that overlaps the mast.
A barrel nut is an internally threaded screw with a slotted head.
to lossen or tighten slotted screws
A lapper sail is a head sail (jib) that overlaps the mast.
A stove bolt is a bolt used in a wood stove. The bolts have a slotted head.
flat head screwdriver for slotted screws, philips head screwdriver for star screws, and alot more...
The head, clew, and tack are the three primary points of a sail.
There are many configurations of plugs and receptacles. The reason for these different configurations is to prevent higher rated amperage devices being inserted into smaller size supplies. In North America there is a NEMA configuration standard that designate the different amperage's and voltages that are allowed to be used for specific purposes. A web search will bring up two specific charts for straight blade devices and twist lock devices.
Sail Rock, Quoddy Head, Maine.