backstay [R01]: A piece of standing rigging on a model yacht that runs from the mast to either its transom or rear quarter, counteracting the forestay and jib.
bolt wire (bolt rope) [R03]: The (wire) rope that is sewn at the edges of the sail to reinforce them, or to fix the sail into a groove in the boom or in the mast. It may also be used with cotter pins or mini screw eyes to attach the sail to the mast.
control loop [R10]: A loop of line or wire placed around a mast or boom to help maintain sail shape.
cotter pins [R11]: Used along with wire to attach the main sail to the mast.
mainsail (main) [R35]: The largest sail on a sailboat, crucial for propulsion, is attached to the mast and controlled by the main sheet.
mast [R37]: A tall spar, or arrangement of spars, erected vertically or near-vertically on the median line of a ship or boat.
mast crane [R38]: A device at the top of the mast to which assorted items attach such as the backstay.
