What does 73 mean in Amateur Radio?

This page is about the meanings of the acronym/abbreviation/shorthand 73 in the Academic & Science field in general and in the Amateur Radio terminology in particular.

Social, Leave Taking, Ending of radio Transmissions, similar to; "wish you well!", '73', 'Best Regards'

Respectable greetings, leave-taking, closure commentary IN all areas of licensed Amateur Radio Operations have been noted for extreme gentility, respect for rights, priveliges, ranks, ratings, in personal, written or 'ON-AIR' EXCHANGES YE ED, FMF WB8AXI, FCC LICENSED OPERATOR: 09/08/2013

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What does 73 mean?

seventy-three, 73, lxxiii(adj)
being three more than seventy

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"73." Abbreviations.com. STANDS4 LLC, 2017. Web. 22 Oct. 2017. <http://www.abbreviations.com/term/595969>.