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A little bit simplified is a typeface a font family whereas a font is a
member of the font family.
So Arial with all its appearances is a typeface while Arial Bold is a font.
In the times when fonts were cut, it had also a special font size, but
tis does not make much sense in scalable fonts.
The glyph is the graphical appearance of a special letter.
I hope I did not make a mistake when simplifying it.
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