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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: The relationship of settings for font in init.el and the one
 shown on "Pick a font" UI.
Date: Thu, 07 Jan 2021 17:04:01 +0200
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 (message from Hongyi Zhao on Thu, 7 Jan 2021 22:39:10 +0800)
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> From: Hongyi Zhao <hongyi.zhao@gmail.com>
> Date: Thu, 7 Jan 2021 22:39:10 +0800
> Cc: help-gnu-emacs <help-gnu-emacs@gnu.org>
> 
> > > Font size 14 --  height 143
> >
> > Pixels vs font units.
> 
> Do you mean 1Pixel = 1/10pt?

I think it's called "points" or something.  I'm not really an expert
on font design, so please forgive me that I don't remember for sure.