Unicode contains several thousand mathematical symbols, including individual code points for different maths alphabets. For example, U+1D434 is "mathematical italic capital A" (), U+1D63C is "math sans bold italic A" (), and so on.
Unfortunately, when mathematics coverage was extended to support all these alphabets, there was a notable omission. For Latin letters, there are glyphs for seven alphabets: italic, bold, bold italic, sans upright, sans italic, sans bold, sans bold italic.
However, Greek letters there are glyphs for only five different forms: italic, bold, bold italic, sans bold, sans bold italic (). There are no "sans upright" or "sans italic" Greek code points.
A number of us in the LaTeX community would like to add the "missing" sans Greek alphabets into Unicode. To have the Unicode Consortium accept the new alphabets, we need to be able to demonstrate examples in published mathematics where, say, a sans serif alpha was used in distinction to a regular italic alpha.
Have you seen such examples yourself? Any pointers to publications (snippets of equations even better) would be extremely helpful.