OS and Software > Webmasters and Developers > Password Generation and exclusion of certain letters/digits

In 1960, DEC engineers realized that in specifying connectors on a frame, where numbers mark the card slot locations and letters mark the connectors on individual cards, some letters cause confusion. Thus the letters G, I, O, and Q were dropped to avoid confusion with C, 1, and 0. The remaining 22 letters were since known as the DEC alphabet[citation needed].