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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: tabulated-list-init-header and glyphless-char-display
Date: Fri, 08 Apr 2011 21:47:29 +0300
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To: Chong Yidong <cyd@stupidchicken.com>
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> From: Chong Yidong <cyd@stupidchicken.com>
> Cc: emacs-devel@gnu.org
> Date: Fri, 08 Apr 2011 14:27:37 -0400
> 
> We can probably use "^" and "v" when the unicode glyphs cannot be
> displayed, but it sure would be nice to the glyphs whereever possible.
> Any idea how to go about checking this?

I think you will find glyphless-char-display (which is a char-table)
useful.