Purpose of and rationale behind Go Markers U+2686 to U+2689

[Ori Avtalion]

On Thu, Mar 10, 2016 at 12:52 AM, Ken Whistler <kenwhistler at att.net> wrote:
> But to know for sure, you would probably have to get confirmation
> of original sources from Barbara Beeton and/or Patrick Ion,
> who collected together symbol candidates from a multitude
> of print sources back in the 1998 - 2001 time frame.

I have emailed Barbara with the question, and pointed to this thread.
Will report back when I get a response.

On Twitter, someone pointed out an example of the two-dot notation,
and even a center-dot notation (instead of the "right dot" of U+2686
⚆).
See page 4 (printed page number 206) of this PDF:
http://library.msri.org/books/Book29/files/kim.pdf