Hand of Glory

Hand of Glory is a hand which gives light only to the beholder. It was purchased by Draco Malfoy in the Borgin and Burkes store. He used it to escape from the Room of Requirement after using Peruvian Darkness Powder.

Muggle Information
The hand of glory has a lot of traditions. Generally, it was a hand taken from an executed man, usually one who was hanged (and most often a murderer or other serious felon). The hand held, or was made into, a candle, traditionally made from the same man's fat. Hands of glory were said to have various powers, including the ability to immobilize anyone within its light, or unlock any door it came across. Traditionally, the Hand of Glory was used when a thief was breaking into a building at night: the Hand would prevent any sleeper from awakening as long as it was lit.

"Hand of Glory" was probably derived from the (European) Mandrake plant, known botanically as Mandragora officinarum. "Mandragora" is close to the French "Maine du glorie,"  which translates to "Hand of Glory." The actual Mandrake plant has a number of alkaloids, including scopolamine and mandragorine. It has been used since ancient times as an anesthetic: chewing the root can cause stupor.

Behind the scenes
The hand appeares in Harry Potter and the Chamber of Secrets (film), old and shrunken and lying on a cushion. When Harry touches it, it grabs his hand viciously until he manages to pry it off again.

It may also be related to the glaring from behind the chips hand: http://profile.myspace.com/index.cfm?fuseaction=user.viewprofile&friendid=426605033. But is just a theory.