This document discusses paralinguistics, which is the study of non-verbal aspects of communication. It provides definitions of paralinguistics as the study of vocal signals beyond basic words and speech. The document then lists and describes several clues of paralinguistics including volume, speed, intonation, pronunciation, tone, articulation, pauses, and punctuation marks. It provides examples of how these paralinguistic cues can change or clarify the meaning of messages. The document was prepared by an engineering student for a communication skills class.