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Typophile threads discussing the history and usefullness of the interrobang:
Chitty Chitty Interrobang Bang
origins of question mark/exclamation mark/interrobang
Bring back the Interrobang
More about the interrobang at the FontFeed:
In general terms a glyph is a symbol that has a meaning -- an arrow, a letter, et cetera. In digital typography the term refers to a single, specific instantiation of a character that appears in a font; the outlines for a particular punctuation, letters or figures (numbers). For example, a given OpenType font might have three different glyphs for a lowercase "a" character: a default double-story form, an alternate single-story form, and a small cap version. In that font, lowercase "a" is one character but three glyphs.
Italic is another style of letter, akin to Roman, but with a more humanist nature.
Italic is not the opposite of Roman, though. It is the opposite of Oblique. Oblique styles may also be called Sloped Roman, and they are mostly the same letterforms found in a Roman face, with a mechanical slant applied (See Oblique). "True" Italic letterforms have been drawn so that they are more formally differentiated from upright Roman letters, the inclination or "cursiveness" (Cursive) is natural to Italics, as it has been conserved from its origins (See Aldus Manutius).
Small caps have many uses, but are primarily used for initials in body copy, such as NASA, NATO or the UN. The aim of this use is to diminish the visual awkwardness of capital letters hindering the flow of a paragraph. (Text figures are also used for better flow in body text versus lining figures.)
From Nick Shinn:
Here are some differing strategies for “Caps with Small Caps” titling.
I don’t think any of them are ideal for this typeface.
In the designated small cap font the small cap is, as I said earlier, too wide.
Type design (strictly)