Final answer:
An approving nod, questioning look, and reminder are forms of 1) non-verbal communication which include gestures, facial expressions, and body positioning, and their interpretation can vary across cultures.
Step-by-step explanation:
An approving nod, questioning look, and a reminder are all examples of 1) non-verbal communication. This form of communication is symbolic and often learned through cultural norms.
Unlike verbal communication, which involves speaking and using words, non-verbal communication often involves body language such as gestures, facial expressions, and body positioning.
Examples include various forms of gestural communication like smiles, frowns, or hand waves that convey different meanings across cultures. Eye contact, another key aspect of non-verbal communication, helps build community, and indicates comfort, and credibility.