In go, pin was the original chinese rating system.
It went from 9 pin, worst, to 1 pin, best.
The translations for 1 pin are something like God enters into his games.
Now, the pin system has been replaced by the dan/kyu system, which runs from 30 kyu (worst) to 1 kyu to 1 dan to 9 dan (best).
Acronym for Personal Identification Number, as seen on bank cards etc. Usually abused as an LA acronym.

Also can mean a pinball table, one of ten targets in the game of bowling, or a small sharp metal object used for bursting balloons.
A pin is a tactical theme in chess. A pin occurs when an attack on a piece is blocked by another piece of the same color.

For an example, imagine you are white. On three consequtive squares, there is the white queen, a white knight, and a black rook. The white knight is pinned, because if it is moved black will be able to take white's queen.

An absolute pin occurs when a piece is pinned to the king. Moving out of an absolute pin is illegal. A relative pin occurs when a piece is pinned to any piece other than the king.

Here is a sample game that contains a pin. It also shows that moving out of an absolute pin can be beneficial.

1. e4 e5
2. Nf3 d6
3. Bc4 Nc6
4. Nc3 Bg4

White's knight on f3 is now pinned. If it is moved, black can capture white's queen.

5. Nxe5!

Sacrificing the queen.

5. ... Bxd1?
6. Bxf7+ Ke7
7. Nd5#


pin (verb)- A wrestling term referring to the state in which one wrestler forcibly contains another wrestler with both shoulders against the mat for a period of time. After the amount of time has been reached the wrestler who excecutes the pin is awarded the win. The required amount of pin time varies depending on the school of wrestling.
Folkstyle/High School - 2 second pin count
Freestyle - Instantaneous pin
Greco Roman - Instantaneous when both shoulders touch or when both shoulders point toward the mat.

Pin (?), v. t. Metal Working

To peen.


© Webster 1913.

Pin (?), v. t. [Cf. Pen to confine, or Pinfold.]

To inclose; to confine; to pen; to pound.


© Webster 1913.

Pin, n. [OE. pinne, AS. pinn a pin, peg; cf. D. pin, G. pinne, Icel. pinni, W. pin, Gael. & Ir. pinne; all fr. L. pinna a pinnacle, pin, feather, perhaps orig. a different word from pinna feather. Cf. Fin of a fish, Pen a feather.]


A piece of wood, metal, etc., generally cylindrical, used for fastening separate articles together, or as a support by which one article may be suspended from another; a peg; a bolt.

With pins of adamant And chains they made all fast. Milton.


Especially, a small, pointed and headed piece of brass or other wire (commonly tinned), largely used for fastening clothes, attaching papers, etc.


Hence, a thing of small value; a trifle.

He . . . did not care a pin for her. Spectator.


That which resembles a pin in its form or use

; as: (a)

A peg in musical instruments, for increasing or relaxing the tension of the strings

. (b)

A linchpin

. (c)

A rolling-pin

. (d)

A clothespin

. (e) Mach.

A short shaft, sometimes forming a bolt, a part of which serves as a journal

. See Illust. of Knuckle joint, under Knuckle. (f) Joinery

The tenon of a dovetail joint.


One of a row of pegs in the side of an ancient drinking cup to mark how much each man should drink.


The bull's eye, or center, of a target; hence, the center.

[Obs.] "The very pin of his heart cleft."



Mood; humor.

[Obs.] "In merry pin."


8. Med.

Caligo. See Caligo.



An ornament, as a brooch or badge, fastened to the clothing by a pin; as, a Masonic pin.


The leg; as, to knock one off his pins.


Banking pin Horol., a pin against which a lever strikes, to limit its motion. -- Pin drill Mech., a drill with a central pin or projection to enter a hole, for enlarging the hole, or for sinking a recess for the head of a bolt, etc.; a counterbore. -- Pin grass. Bot. See Alfilaria. -- Pin hole, a small hole made by a pin; hence, any very small aperture or perforation. -- Pin lock, a lock having a cylindrical bolt; a lock in which pins, arranged by the key, are used instead of tumblers. -- Pin money, an allowance of money, as that made by a husband to his wife, for private and personal expenditure. -- Pin rail Naut., a rail, usually within the bulwarks, to hold belaying pins. Sometimes applied to the fife rail. Called also pin rack. -- Pin wheel. (a) A contrate wheel in which the cogs are cylindrical pins. (b) Fireworks A small coil which revolves on a common pin and makes a wheel of yellow or colored fire. <-- a toy with lightweight, usually brightly colored vanes, as of plastic, which revolve on a pin at the end of a stick, when acted on by a wind -->


© Webster 1913.

Pin (?), v. t. [imp. & p. p. Pinned (?); p. pr. & vb. n. Pinning.] [See Pin, n.]

To fasten with, or as with, a pin; to join; as, to pin a garment; to pin boards together.

"Aa if she would pin her to her heart.



To pin one's faith upon, to depend upon; to trust to.


© Webster 1913.

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