Gunpowder

Gunpowder, formerly known as Sulphur, is an item that can be obtained by killing a Creeper, can be found in some dungeon chests and were originally dropped by ghasts before 1.8

Uses
Five units of gunpowder are needed to create a block of TNT. Also, one can brew it with any potion to make a Splash Potion.

History
In Indev, mob drops were randomized, so when a Pig was killed it could drop gunpowder instead of Pork (seen here).

Gunpowder was renamed Sulphur in Beta 1.0, but reverted to its original term in version 1.3.

As of Pre-release 4 of the 1.9 update, gunpowder can be used in brewing to create splash potions.

Trivia

 * Gunpowder was once named "Sulfur" in the Minecraft Beta 1.0 update, but later changed back to "Gunpowder" in Minecraft Beta 1.3

Schießpulver Sulphur/es Poudre à canon Puskapor Gunpowder/ko Buskruit Proch Порох Gunpowder/ch