The Letter 'X' Stands for the Unknown, the Mysterious, and the Intangible. Why? - Atlas Obscura
By A Mystery Man Writer
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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C.S. Lewis - File 770
The Letter 'X' Stands for the Unknown, the Mysterious, and the Intangible. Why? - Atlas Obscura
Ancient Egypt The Light of The World by Gerald Massey, PDF, Ancient Egypt
ODLIS: Online Dictionary
