That's helpful. Wikipedia page for "glyph" seems to concur: "For example, in most languages written in any variety of the Latin alphabet the dot on a lower-cas

That's helpful. Wikipedia page for "glyph" seems to concur: "For example, in most languages written in any variety of the Latin alphabet the dot on a lower-case "i" is not a glyph because it does not convey any distinction, and an i in which the dot has been accidentally omitted is still likely to be read as an "i". In Turkish, however, it is a glyph because that language has two distinct versions of the letter "i", with and without a dot."