Shahab-4

The Shahab-4 (Persian: شهاب ۴, meaning "Meteor-4") (a.k.a. IRIS) was an unbuilt Iranian rocket, derived from the Shahab-3 medium-range ballistic missile. According to Iran it was intended to be a space launch vehicle, after a slip by the Defense Minister in which he acknowledged it as a "more capable ballistic missile than the Shahab-3". According to Western observers, it was intended to be part of a nuclear-capable ballistic missile.