Intercontinental ballistic missile

 is the abbreviation for "InterContinental Ballistic Missile". An ICBM is a ballistic missile with a long range typically designed for nuclear weapons delivery (delivering one or more nuclear warheads).

Fallout 3
ICBM silos can be found throughout the Capital Wasteland. A (non-functional) ICBM launch terminal, launch codes, and facility can be found at Fort Constantine. The launch codes are for a Minuteman XI missile.

Fallout New Vegas
Raul Tejada recalls seeing Mr. House's anti-missle defense systems shoot down Chinese ICBM's during his unmarked quest Old School Ghoul.