Intermediate-range ballistic missile
An intermediate-range ballistic missile (IRBM) is a ballistic missile with a range between 3,000 and 5,500 kilometres (1,900–3,400 mi), categorized between a medium-range ballistic missile (MRBM) and an intercontinental ballistic missile (ICBM). Classifying ballistic missiles by range is done mostly for convenience.
Source: Wikipedia — Intermediate-range ballistic missile (CC BY-SA 4.0)