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Signals, signs, and symbols, three related components of communication processes found in all known cultures, have attracted considerable scholarly attention because they do not relate primarily to the usual conception of words or language. Each is apparently an increasingly more complex modification of the former, and each was probably developed in the depths of prehistory before, or at the start of, early human experiments with vocal language. A signal may be considered as an interruption in a field of constant energy transfer. An example is the dots and dashes that open and close the electromagnetic field of a telegraph circuit. ...(100 of 6421 words)