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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: what coding system to select when I insert a unicode character
Date: Wed, 26 Dec 2018 17:43:15 +0200
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> From: Angus Comber <anguscomber@gmail.com>
> Date: Wed, 26 Dec 2018 10:38:37 +0000
> 
> I sometimes need to insert mathematical symbols into my emacs text files
> and when I do I get prompted for a coding system.  And the default is
> japanese-shift-jis which seems strange when less than half the population
> of the world is Japanese.

This is fixed in Emacs 27, it suggests UTF-8 in most such cases.