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Signs, signification, and semiotics (semiology) Nonvocal communication. 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, man's early experiments with vocal language. Signals. 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. Such interruptions do not require the construction of a man-made field; interruptions in nature (e.g., the tapping of a pencil in a silent room, or puffs of smoke rising from a mountain top) may produce the same result. The basic function of such signals is to provide the change...