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What is a glyph and what do we use it for especially in context of silverlight and xaml?
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In information technology, a glyph (pronounced GLIHF ; from a Greek word meaning carving) is a graphic symbol that provides the appearance or form for a character . A glyph can be an alphabetic or numeric font or some other symbol that pictures an encoded character.
The way glyphs change is important to the overall concept of print design because these symbols are a huge part of print. The symbols we see every day that represent various companies and ideas are all glyphs, and the idea of utilizing these symbols to further one's ideas is an age-old concept.
Definition of glyph 1 : an ornamental vertical groove especially in a Doric frieze. 2 : a symbolic figure or a character (as in the Mayan system of writing) usually incised or carved in relief. 3 : a symbol (such as a curved arrow on a road sign) that conveys information nonverbally.
A glyph is a single representation of a character. Every font has a Unicode character map that links (abstract) character IDs with how to display that character, using the default glyphs.
Glyphs are a low-level depiction of a character to be drawn on-screen. A good article on them is available on MSDN: Introduction to the GlyphRun Object and Glyphs Element.
Posting a link for you read, I think it is better than simply rehashing the information in my answer (it has pictures and links for further reading).
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