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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Unicode Support
Date: Fri, 05 Jun 2020 23:27:59 +0300
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 (message from Nicholas Papadonis on Fri, 5 Jun 2020 15:25:22 -0400)
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> From: Nicholas Papadonis <nick.papadonis.ml@gmail.com>
> Date: Fri, 5 Jun 2020 15:25:22 -0400
> 
> I used 'M-x insert-char 1F600' to insert a smile emoji in the buffer.  A
> square box with 1F600 as text appears instead.  I notice when 'cat' ing the
> file out the smile emoji appears correctly in my terminal.
> 
> Does Emacs 26.1 GTK+ 2019-09-22 build support display of all the Unicode
> characters?

It does.  But you need to have a font available to Emacs that is
capable of displaying them.