The top of the pin is called the head of the pin.
because its pointed like a pin at the top aka the vane
An oar pin is also called a rowlock pin or a thole.
A wrist pin is a small pin that goes through the side of the piston to hold it to the top of the crankshaft rod. It is called a wrist pin because it allows the piston to move up and down, like moving your wrist up and down.
you walk on top of it
The one closest to you is the head pin, or 1 pin. The rest of the pins are numbered from left to right on each row: the second row has the 2 and 3, third has 4, 5 and 6, and the fourth row has 7, 8, 9 and 10.
A thumbtack
hot wire
the pin part of a brooch is called the clasp
One pin for phase other pin for neutral and third one is for earth/ground wire. In India the right pin is for phase, left pin is for neutral and pin on top side is for ground wire. This third top side pin is slightly bigger and longer compared to phase and neutral pins.
an oar pin is called thole
the pin is hidden on the top of the lighthouse. u will see it
a thumb tack has a flat circle top while a push pin has the tower like top.