Oh man ~ I just looked it up. This is totally the kind of thing I could have known.
28. What is the origin of "-30-" at the end of some press releases?
The "-30-" is the traditional journalistic closing which probably came to be during the Civil War when telegraphers tapped "XXX" at the end of a transmission, which is the Roman numeral for 30.
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timeasmymeasure
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Date: 2007-05-21 01:44 pm (UTC)28. What is the origin of "-30-" at the end of some press releases?
The "-30-" is the traditional journalistic closing which probably came to be during the Civil War when telegraphers tapped "XXX" at the end of a transmission, which is the Roman numeral for 30.
http://www.press-release-writing.com/frequently-asked-questions.htm#28