Elefant (German for "elephant") was a heavy tank destroyer (self propelled anti-tank gun) used by German Panzerjäger (anti-tank units) during World War II. Ninety-one units were built in 1943 under the name Ferdinand (after its designer Ferdinand Porsche) using VK 45.01 (P) tank hulls which had been produced for the Tiger I tank before the competing Henschel design had been selected.
Following their use at the battle of Kursk, in January to April 1944 the surviving Ferdinands received modifications and upgrades. They were renamed Elefant in May 1944. The official German designation was Panzerjäger Tiger (P) and the ordnance inventory designation was Sd.Kfz. 184.
--copied from Wikipedia
