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* [[92 Code]] Western Union telegraph brevity codes
* [[Q code]] - initially developed for commercial radiotelegraph communication, and later adopted by other radio services, especially amateur radio. Used since circa 1909.
* [[QN Signals]] - published by the ARRL and used by [[Amateur radio]] operators to assist in the transmission of [[ARRL Radiogram]]<nowiki/>s in the [[National Traffic System]].
* R code - published by the British Post Office in 1908 for use only by British coastal wireless stations and ships licensed by the Postmaster General.<ref name=":0">{{Cite web|url=http://ac6v.com/rcode.htm|title=R - CODES AND S - CODES|last=|first=|date=|website=|archive-url=|archive-date=|dead-url=|access-date=}}</ref>
* S code - published by the British Post Office in 1908 for use only by British coastal wireless stations and ships licensed by the Postmaster General.<ref name=":0" />
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