Hmm... Not quite a writing system. It's called "hunminjunghum", although
the Web page title spells it "mun...".
<http://www.kcaf.or.kr/art500/kangairan/y90/view/g9041.htm>
It's a 2 (col.) by 3 (row) dot matrix.

Fwiw, just now, I'm adding han'gul charts to my archives. It seems that
the counts of vowels and consonants vary from one source to another...

Regards,

--
Nicholas Bodley /*|*\ Waltham, Mass. (Not "MA")
The curious hermit -- autodidact and polymath
If you're determined to be afraid, choose wisely
what to be afraid of.