mcc on Nostr: In Unicode there is a character ༺ named "Tibetan Mark Gug Rtags Gyon". It has ...

In Unicode there is a character ༺ named "Tibetan Mark Gug Rtags Gyon". It has category "open punctuation". It is apparently paired with a character ༻, or "Tibetan Mark Gug Rtags Gyas", which is in category "closing punctuation".

On Google, I cannot find any results about this which discuss anything other than the fact of their inclusion in Unicode. This old doc

https://www.w3.org/TR/2020/WD-tlreq-20200616/

describes a KHANG GYON and KHANG GYAS, but doesn't explain the function of "Rtags".

How could I learn more?