Initialism of International Business Machines. / Initialism of International Brotherhood of Magicians. / (geology) Initialism of Izu-Bonin-Mariana Arc.

Intercontinental ballistic missile; ICBM. / (figuratively) A company that dominates its field.

plural of IBM

The original version and progenitor of the IBM PC compatible hardware platform. / (slightly dated) A microcomputer compatible with IBM's specification.

plural of IBM PC

The axiom that "machines should work; people should think".