What does the HAM stand for in HAM radio?

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Nobody is really sure, not even the authorities and old-timers in the hobby itself.
The formal designation for that service is "Amateur Radio".

One theory is that H.A.M. is an acronym paying homage to three great radio pioneers:
Heinrich Hertz (demonstrated existence of electromagnetic waves),
Edwin Armstrong (invented modern FM radio), and
Guglielmo Marconi (developed wireless telegraphy).

Another theory is when the first amateur radio operators where using CW (Morse Code), that they tended to have a "heavy" (hard) hand, and was called being "ham fisted". This tends to be the most common theory, by the ARRL. (KC0KM)
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