Considering the description in the question, the term that was used by Don Norman to describe these visible affordances is Signifier.
- This is because Don Norman defined Signifier as any sign or tone that can be observed and send a form of communication that defines a certain behavior to the people.
- He further described that a signifier is any reference that is utilized to express or described what affordances things entail.
- Don Norman is famous for being the author of The Design of Everyday Things.
- He is also known as the director of The Design Lab at the University of California, San Diego.
Hence, in this case, it is concluded that the term that was used by Don Norman to describe these visible affordances is Signifier.
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