Jisho

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Wikipedia definition
1. Sign-offSign-off (or closedown) is the sequence of operations involved when a radio or television station shuts down its transmitters and goes off the air for a predetermined period; generally this occurs during the overnight hours. It is the opposite to a sign-on (or startup) which usually takes place at the start of the day.
Read “Sign-off” on English Wikipedia
Read “局名告知” on Japanese Wikipedia
Read “Sign-off” on DBpedia

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