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From: ams@gnu.org (Alfred M. Szmidt)
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Subject: Re: GNU Emacs raison d'etre
Date: Sat, 30 May 2020 12:43:00 -0400
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     > > What does C-g mean? Why the sequence C-g specifically? I think the
     > > disconnect may be that C-g appears outwardly meaningless.

   I will ask Greenblatt -- he might remember.

I suspect there is no deep meaning behind it, the BEL was common way
back then to mean abort, or alert.  TECO and DDT both used C-g for
abort, and since DDT commands where some sort of a C-<ch> sequence it
probobly just made sense..