A decorative nail with a round, domed head, usually made of, or plated with, brass or copper, and used for fastening escutcheons, label-card holders, or other decorative surface hardware to wood surfaces.

A pin, somewhat similar in shape, though larger than, a safety pin or bobby pin, which is inserted through the outer, front apron, or through both aprons of a kilt or a kilt-skirt.

(sewing) A pin in the form of a clasp, which has a guard to cover the sharp point; used to join two pieces of fabric, etc., together temporarily.

Alternative spelling of rolling pin

A system for verifying that the bearer of a debit card or credit card is the owner, involving cards that contain a silicon chip storing the PIN of the card; the bearer confirms ownership of the card by inserting it into a machine and entering the PIN, which is compared with the one stored on the chip.

A common alternative form of PIN (in the sense of "personal identification number").

a food preparation utensil consisting of a cylinder with a handle at each end, used to flatten dough

Part of clevis fastener that allows rotation of the connected parts about the axis of the pin. A clevis pin consists of a head, shank and hole. The hole passes through the shank at the opposite end of the pin from the head. A cotter pin or similar through the hole keeps the clevis pin in place.

(colloquial) To opt out; to withdraw; to resign.

(UK) (simile) Very neat and tidy.