U+1FBD GREEK KORONIS: ᾽

Dear subscribers to the Unicode public general mail list,
Can anyone tell me what the intended use(s) of the character ᾽ (U+1FBD
GREEK KORONIS) is/are, please? Or, failing that, where I can find out?

Many thanks in advance for any help you can provide. Apologies if this is
not the right forum in which to ask this question.

Yours faithfully,
I.S.M.E.T.A.
Received on Tue Nov 01 2016 - 09:18:40 CDT