IBM began life as Computing-Tabulating-Recording Co. (C-T-R), a rag-tag amalgamation of pseudo-information companies assembled in an acquisition by Wall Street financier Charles Flint in 1911.

Indeed, it was J. C. R. Licklider, a legendary official at the Defense Advanced Research Projects Agency, who was a pioneer in proposing the idea of a "man-computer symbiosis."

R So if C is the circle, R is the disk of radius A.