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It's also the name of a game studio with a number of neat titles, some rock band, and perhaps most importantly, sequel to Alice in wonderland: Through the Looking-Glass, and What Alice Found There

All of which were probably referring to the same concept: viewing the other side of reality

Looking-glass was just a peculiar literary term for a mirror in the 1800s. A reflective glass you would look at.

Also Sun's Project Looking Glass 3D desktop environment: https://en.wikipedia.org/wiki/Project_Looking_Glass

If anything, it's a nod to Looking Glass Studios. Arkane's Prey is intended to be a spiritual successor to System Shock. (I presume that's what you're talking about, even though it's not related to the original 2006 Prey.)

It’s another word for mirror and has cool vintage/steampunk/Victorian associations so it’s going to be used by a lot of different people.

> ...coincidence or a nod.

That depends on the patent status. Without patent => nod; with patent => theft.

Patent or trademark?