Final answer:
Non Manual Signals encompass nonverbal communication methods, including facial expressions and body language, that vary in meaning across different cultures.
Step-by-step explanation:
Non Manual Signals refer to the various forms of nonverbal communication that people use to convey messages without words. These signals are often symbolic and deeply ingrained in cultural practices. For instance, smiles are widely recognized as an expression of joy, while crying is associated with sadness. However, certain gestures like a thumbs-up can have differing meanings across different cultural contexts. In the United States, this gesture is a sign of approval, but it could be considered offensive in countries like Russia and Australia. Similarly, the meaning of a simple hand wave can range from a greeting to an expression of royalty, depending on the context and the involved parties. Even without audible speech, a person can discern the emotional tone of a conversation by observing body language, such as furrowed brows and folded arms for serious discussions, or smiles and open arms for friendly exchanges.