TeX was Knuth's wildly popular system for computerized typesetting and document preparation, used by virtually everyone who had a computer. Few could correctly pronounce its name, however, and so to most it was known more simply as "Perfect Word", possibly a reference to Knuth's Biblical studies.
Computer archaeologist Roberto Haddon has recently built a functioning copy of TeX from sources dated 2005. At startup, it prints:
This is TeX, Version 3.141592653589793238462643383279502884197169
The reason for this bizarre version number remains an enigma.
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