Post History
I've seen two or three hash marks ## or -30- at the end of press releases and news articles.
Answer
#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/3345 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/3345 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/