Eye of Ender

An Eye of Ender is a one-use item the player can create to repair an Ender Portal Frame block which are found naturally in Strongholds.

As shown by Jeb in his livestream, it can also be thrown, acting as a guide to locate the Air Portal Frame found within Strongholds. There is a chance that it will disappear after being thrown, "returning to the Ender"; however, this is likely a future addition as the ability to throw has not been yet been added to Pre-Release 3.

History
It was first added in Beta 1.9 Pre-release 3.

Trivia

 * This item doesn't resemble an Enderman's eye since Enderman eyes are purple with white pupils while this eye is more reptilian. The new addition of Enderdragons makes this seem like a possible drop from them.