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This tag is for questions specifically related to the English language as spoken and written in the USA. If you are interested in a difference between American English and British English, please use transatlantic-differences.

10 votes

Special term/phrase for the 'perfect' or 'impossible' object or solution?

Unobtainium. This one works well in a scientific/technical setting. Unobtainium is an element/material that is infinitely strong, has zero mass, is impervious to all wear, chemicals, etc., and costs …
Glen Yates's user avatar