You know what it looks like… but what is it called?
TAKE THE QUIZ“way mirror”
The following 2 entries include the term way mirror.
one-way mirror
noun: a piece of glass that is a mirror on one side but that can be seen through like a window from the other side
two-way mirror
noun: a piece of glass that is a mirror on one side but that can be seen through like a window from the other side
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Merriam-Webster unabridged