The Letter 'X' Stands for the Unknown, the Mysterious, and the Intangible. Why? - Atlas Obscura

From Twitter's rebranding to The X-Files to algebra, this single letter has an uncommon amount ofX factor. A historian of mathematics gets to the root of it.

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What does the letter 'X' mean? Branding experts weigh in

The Spectralities Reader: Ghosts and Haunting in Contemporary Cultural Theory 9781441138606, 9781441105592, 9781628928440, 9781441124784

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literature Archives - Sci Phi Journal

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What does the letter 'X' mean? Branding experts weigh in