Final answer:
The scenario described in the question is an example of non-verbal communication.
Step-by-step explanation:
The scenario described in the question is an example of non-verbal communication. In this case, the instructor calmly blinking one eye while the class erupts in protest conveys a message without using words. Non-verbal communication includes facial expressions, gestures, and body language, which can all convey emotions and attitudes. In this example, the instructor's calm response may indicate indifference or lack of concern towards the students' protests.