The kind used in locker rooms looks like a mirror from the inside and is transparent from the outside. What is the name of that material?

That's not a one-way mirror, that's a two-way mirror.

The two-way mirror is the kind of mirror we often see on TV and in the interrogation rooms of police stations where prisoners are interrogated. From inside the house, it looks like just a mirror, but the person behind the mirror can see everything going on in the house.

This method of identifying two-way mirrors is the result of technology and research gained by American policewomen traveling in various states.

How to detect a two-way mirror? When we enter a toilet, bathroom, hotel room, dressing room, etc., how do you know whether an ordinary mirror hanging on the wall is a real mirror, or is actually a two-way mirror (they can see you, but you can't see them) )? There have been many instances of people installing two-way mirrors in women's changing rooms to facilitate peeping. And it is very difficult for us to judge it from the surface. However, it may be easy to tell if we do a very simple test after looking in the mirror.

You only need to place the tip of your nail on the surface of the mirror. If there is a gap between the tip of the nail and the reflected image, it is a real mirror; however, if the tip of your nail can directly touch Nail reflection image, be careful! That’s a two-way mirror!

Please remember to do the "nail test" every time you look in the mirror. That costs you nothing. It’s just a simple action, and it can also save you from being “visually raped”!

A one-way mirror is the mirror we use in our homes