does anybody know about these accidentals?

[Hans Åberg]

> On 24 Jul 2024, at 22:33, Jim DeLaHunt via Unicode <unicode at corp.unicode.org> wrote:
> 
> What specifically would you like to know about these accidentals?  What do you "wonder about the origin of" [these two characters]? If you would write a message with your questions, I will post that in these two foums.

Even though one example was given here upthread, a score where it is used, it is hard to find any other examples of it by searches. At the same time, Unicode does not have much of microtonal accidentals, so it is curious it ending up in it. So the question is what is its origin?