Quiver

The Quiver is a sprite located in Minecraft's textures/items resource file. It has no actual item in-game and thus is impossible to obtain. Jeb has confirmed that he is not planning to add quivers.

Trivia

 * In Legend of the Chambered (an abandoned RPG that Notch made), there was a quiver item available to be picked up as loot. Notch reused the sprite from that game and put it in Minecraft, albeit flipped horizontally.
 * The Quiver is obtainable in Minecraft Pocket Edition through inventory editors. However, if you select it in your hot bar, the game will freeze. The quiver is not intended to exist in game, it is just a blank item using the quiver sprite.