TikTok is full of people “discovering” spy mirrors in their hotel rooms and AirBnBs. Or, more often, they use a normal hotel mirror to demonstrate you a trick that supposedly reveals such ...

At Eastern Connecticut State University's new childhood development center, the use of observation rooms with one-way mirrors to study children's behavior has been replaced by voice- and ...

It's of a type commonly known as one-way mirror glass, two-way mirror glass, or half-silvered mirror.