A Pin

1. A needle without an eye (usually) made of drawn-out steel wire with one end sharpened and the other flattened or rounded into a head, used for fastening.
2. A small nail with a head and a sharp point.
3. A cylinder often of wood or metal used to fasten or as a bearing between two parts.
4. (wrestling, professional wrestling) The victory condition of holding the opponent's shoulders on the wrestling mat for a prescribed period of time.
5. A slender object specially designed for use in a specific game or sport, such as skittles or bowling.
6. (informal, in the plural) A leg.
7. (electricity) Any of the individual connecting elements of a multipole electrical connector.
8. A piece of jewellery that is attached to clothing with a pin.
9. (US) A simple accessory that can be attached to clothing with a pin or fastener, often round and bearing a design, logo or message, and used for decoration, identification or to show political affiliation, etc.Synonyms: badge, lapel pin
10. (chess) A scenario in which moving a lesser piece to escape from attack would expose a more valuable piece to attack.
11. (golf) The flagstick: the flag-bearing pole which marks the location of a hole
12. (curling) The spot at the exact centre of the house (the target area)
13. (dated) A mood, a state of being.
14. One of a row of pegs in the side of an ancient drinking cup to mark how much each person should drink.
15. (medicine, obsolete) Caligo.
16. A thing of small value; a trifle.
17. A peg in musical instruments for increasing or relaxing the tension of the strings.
18. (engineering) A short shaft, sometimes forming a bolt, a part of which serves as a journal.
19. The tenon of a dovetail joint.
20. (Britain, brewing) A size of brewery cask, equal to half a firkin, or eighth of a barrel.
21. (informal) A pinball machine.

Synonyms

• (small nail): nail, tack
• (cylinder of wood or metal): peg
• (games): skittle
• (jewellery fastened with a pin): brooch