What is the current status of the Greek numeral signs — dexia keraia and aristeri keraia — in contemporary Greek usage? Do today’s Greek users employ these marks and this system at all? Wikipedia seems to indicate that they are occasionally used for indicating ordinals, rather than Arabic numerals, somewhat akin to how Latin users might use Roman numerals occasionally.
Unicode indicates that the dexia keraia U+0374 has a canonical decomposition to U+02B9 modifier prime. And I have experienced some cut-and-paste actions on Mac that convert the former codepoint to the latter.
Not a lot of fonts that include [monotonic] Greek coverage seem to include these codepoints. I have found some fonts that include U+0374, but not the equivalent U+02B9 (which seems problematic, given the above-mentioned normalization behavior).
Most of the fonts that I’ve encountered that have U+0374 also have the lower form U+0375, but not all. The online tester at Parachute fonts (Greek foundry) seems to indicate that they do not, which seemed curious to me.
And if one includes support for U+0374/02B9 and U+0375, does this beg the question of the Stigma, Koppa, and Sampi (uppercase, lowercase, or both)?
Is inclusion for all of these typically only considered if providing support for polytonic Greek setting?
None of these codepoints appears to be readily accessible from the MacOS’s Greek keyboard, although all seem to be present via the Greek Polytonic keyboard (except I could not find the aristeri keraia).
What is the situation for the average modern Greek user, in terms of accessibility and practice?
I am interested in any experienced perspectives, but particularly those of Greek members of our community.