Accented glyphs are a very restricted subclass of compound glyphs.
An accented glyph is formed from one primary component and one or more secondary components. Except for the actual outline, all properties of an accented glyph are shared with the primary component or is derivable from the properties of the primary and secondary glyphs. Examples include metrics, kerning values, and postscript names. The components cannot be accented glyphs. Components must be outlines, not bitmaps.