ETYM Old Eng. pinne, as. pinn a pin, peg.
1. A piece of jewelry that is pinned onto the wearer's garment.
2. A small slender (often pointed) piece of wood or metal used to support or fasten or attach things, especially in sewing.
3. Flagpole used to mark the position of the hole on a golf green; SYN. flag.
4. Informal terms of the leg; SYN. peg, stick.
5. Two-part cylindrical tumblers held in place by springs; when they are aligned with a key the bolt can be thrown.