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• Tech giant originally founded as the Computing-Tabulating-Recording Company: Abbr
• Early PC maker
• Deep Blue creator
• Developer of NASA's computers in the 1960s
• Tech company that sold off its PC product line in 2005
• Big name in cloud computing
• Its name is also its N.Y.S.E. symbol
• Major tech stock
• 49-Down, with each letter shifted one place later in the alphabet (coincidence?)

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
also (in early use) I.B.M. , initialism (acronym) attested by 1921 from International Business Machines Co., name in use from 1918.