Key Chains
A keychain or key chain is a small chain, usually made from metal or plastic, that connects a small item to a keyring. The length of a keychain allows an item to be used more easily than if connected directly to a keyring. more...
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Some keychains allow one or both ends the ability to rotate, keeping the keychain from becoming twisted, while the item is being used. A keychain can also be a connecting link between a keyring and the belt of an individual. It is usually employed by personnel whose job demands frequent use of keys, such as a security guard, prison officer, janitor, or retail store manager. The chain is often retractable, and therefore may be a nylon rope, instead of an actual metal chain. The chain ensures that the keys remain attached to the individual using them, makes accidental loss less likely, and saves on wear and tear on the pockets of the user.
A keychain can also be a short chain used to link together a number of keys or other items. Sometimes keychains are hung on walls.
Keychain items
Items commonly attached via a keychain or keyring include:
Bottle openers;
Compasses;
Digital sound recorders;
Discount barcodes/magnetic strips;
Electronic games;
Flashlights;
Keyrings;
Laser pointers;
Lighters;
Logos, slogans, or phrases;
Memo pads;
Ornamental or decorative items;
Personal sirens;
Pill boxes;
Photos (photo holders);
Rabbit's feet;
Religious items (e.g., crosses Traveller's Prayers or hamsas);
Tape measures;
Text labels;
Thermometers (analog and digital);
Tools (e.g., Swiss Army knives);
Security tokens;
USB flash drives;
Vehicle remote keyless system;
Watches and stopwatches;
Whistles;
Computer keychains
Keychain was first introduced in a series of IBM developerWorks articles.
By analogy to the physical object, the terms keychain and keyring are often used for software that stores cryptographic keys. Mac OS X uses a password storage system called Keychain. GNU Privacy Guard stores known keys on a keyring.
Read more at Wikipedia.org
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