IBM

noun3

1. •
   (figurative) A company that dominates its field.

   • Univac was the IBM of the computer industry's incipiency; in 1952 Univac had virtually 100% of the market. — 1968
2. •
   Initialism of intercontinental ballistic missile.

   • They see this last possibility in an international agreement to stop further atomic and thermonuclear bomb tests and halt the development of intercontinental ballistic missiles (IBMs). — 1956
3. •
   Initialism of inclusion body myositis.