Which of the following is not a type of nonverbal communication discussed?

The term "illuminators" is not recognized as a specific type of nonverbal communication in the literature. Nonverbal communication encompasses various forms of expressing messages without the use of words, and it includes categories like emblems, adapters, and illustrators.

Emblems are gestures that have a specific agreed-upon meaning within a culture, such as a thumbs-up signifying approval. Adapters are gestures that are often unconscious and related to self-soothing or managing emotions, like fidgeting with one's hair. Illustrators are movements that accompany verbal messages and help convey meaning more vividly, such as using hand gestures to show the size of an object being discussed.

Thus, "illuminators" does not fit into the established categories of nonverbal communication, making it the correct answer in this context.