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I can't even find a picture of it because I don't know what to search for. It's a circular rubber foot that attaches typically to glass, by creating a little vacuum when you press it onto the surface. What's it called?

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    Yep, the common form is a "suction cup". – Hot Licks Apr 5 '18 at 21:31
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It's called a suction cup. According to Wikipedia:

A suction cup, also known as a sucker, is a device or object that uses the negative fluid pressure of air or water to adhere to nonporous surfaces, creating a partial vacuum.

Attribution: "Suction Cup." Wikipedia. February 28, 2018. Accessed April 05, 2018. https://en.wikipedia.org/wiki/Suction_cup.

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It is called a cup.

The flexible version is a suction cup.

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