The Noto characters are from the Unicode definitions, so that's where you should look to understand why those characters exist. These proposals provides some ba

The Noto characters are from the Unicode definitions, so that's where you should look to understand why those characters exist. These proposals provides some background: http://www.unicode.org/L2/L2008/08132r-n3427r-syllabics.pdf http://www.unicode.org/L2/L2008/08132r-n3427r-syllabics.pdf http://www.unicode.org/L2/L2008/08342-n3507-syllabics.pdf http://www.unicode.org/L2/L2008/08342-n3507-syllabics.pdf