Introduction to digital communication - MIT OpenCourseWare
https://ocw.mit.edu/courses/6-450-principles-of-digital-communications-i-fall-2006/2c67a3e5fa6910d378603d582c6efab8_book_1.pdf
WEB1A digital sequence is a made up of elements from finite alphabet (e.g., the binary digits {0,1} the decimal digits {0,1,... ,9}, or the letters of the English alphabet) . The binary digits are almost universally used for digital communication and storage, so we only distinguish digital from binary in those few places where
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