Not only Daud.... --- ...as nonverbal includes different forms of communication such as body language, facial expressions, signalling, etc.

The unsaid here refers more to the difference between locution and illocution, i.e., what was meant by what was said, but also to the choice of words to express certain idea/message, or a deliberate omission of something/someone from an utterance. E.g., not mentioning someone when thanking people who have helped you achieve something is a clear indication of your view how that person did not help you at all, i.e., you convey the message without actually expressing anything, etc.

Source author: Andrej Skrinjaric andrejs@diplomacy.edu