30 may refer to:
30 (number), the natural number following 29 and preceding 31
one of the years 30 BC, AD 30, 1930, 2030
-30- has been traditionally used by journalists in North America to indicate the end of a story or article that is submitted for editing and typesetting. It is commonly employed when writing on deadline and sending bits of the story at a time, via telegraphy, teletype, electronic transmission, or paper copy, as a necessary way to indicate the end of the article. It is also found at the end of press releases.
The origin of the term is unknown. One theory is that the journalistic employment of -30- originated from the number's use during the American Civil War era in the 92 Code of telegraphic shorthand, where it signified the end of a transmission and that it found further favor when it was included in the Phillips Code of abbreviations and short markings for common use that was developed by the Associated Press wire service. Telegraph operators familiar with numeric wire signals such as the 92 Code used these railroad codes to provide logistics instructions and train orders, and they adapted them to notate an article's priority or confirm its transmission and receipt. This metadata would occasionally appear in print when typesetters included the codes in newspapers, especially the code for "No more – the end", which was presented as "-30-" on a typewriter.
30 is a square pyramidal number. 30 is an even, composite, pronic number. With 2, 3, and 5 as its prime factors, it is a regular number and the first sphenic number, the smallest of the form , …
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30 (thirty) is a number. It is an even number. It is divisible by 1, 2, 3, 5, 6, 10, 15, and 30. It is a composite number. It is the number between 29 and 31. In roman numerals it is XXX.
The factors of 30 are the numbers that divide 30 exactly without leaving a remainder. As the number 30 is an even composite number, it has factors other than 1 and 30. Thus, the factors …
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30 may refer to: 30 (number), the natural number following 29 and preceding 31; one of the years 30 BC, AD 30, 1930, 2030
a number equal to three times 10; the numbers 30 to 39; specifically : the years 30 to 39 in a lifetime or century… See the full definition
Jun 17, 2023 · The number 30 holds significance as it represents a point in life when individuals have typically gained considerable wisdom and maturity. By the age of 30, many people have …
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