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I've been looking for a word that describes of an object the function of which is not yet known. I feel like that the word is very familiar to many English reader and speakers.

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Not necessarily exactly what you're looking for, but provided that such object wouldn't have a specific name, people could probably refer to it as thingamajig or thingamabob.

From m-w:

Thingamajig: something that is hard to classify or whose name is unknown or forgotten

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