Iron

Iron may refer to the following:
 * Iron (element)- A material used by the UNSC.
 * Iron Skull - A skull that can be found in both Halo 2 and Halo 3.
 * Halo 2's Iron Skull
 * Halo 3's Iron Skull
 * Iron (achievement) - The Halo 3 achievement for obtaining the Iron skull.