In today's time, slang is becoming much bigger, and the words we think have one meaning can mean multiple things now. For example, you can say the word "bad" out loud; one person might think bad as a negative and another might think bad in slang terms, which is a positive: same language, same word but different meanings.

Encoding is almost like a subconscious thought. As they said at the bottom of the paragraph, we notice that the person has headphones on which is the turning thought process so we find a solution to get his attention by waving as a form of communication. We might not think that waving to get someone's attention is a form of communication since it is not verbal but there is silent communication such as waving hello or bye or to get someone's attention, etc.

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