into Korean. The expected shape of ng had the additional problem that, by being just the vertical line left by removing the top stroke of ㄱ, it would have been easily confused with the vowel ㅣ . Sejong's solution solved both these problems: the vertical stroke from ㄱ was added to the null symbol ㅇ to create ᇰ, graphically representing both regional pronunciations as well as being easily legible. (If your browser doesn't display this, it's a circle with a vertical line on top, like an upside-down keyhole or lollipop.) Thus ᇰ was pronounced ng in the middle or end of a word, but was silent at the beginning. Eventually the graphic distinction between the two silent initials ㅇ and ᇰ was lost. Two additional details lend credence to Ledyard's hypothesis. For one, the composition of obsolete ᇢᇦᇴ w, v, f (for Chinese initials 微非敷), from the graphic derivatives of the basic letter ㅂ b [p] (that is, ㅁㅂㅍ m, b, p) by adding a small circle under them, is parallel to their Phagspa equivalents, which were similarly derived by adding a small loop under three graphic variants of the letter h. Now, this small loop also represented w when it occurred after vowels in Phagspa. The Chinese initial 微 represented either m or w in various dialects, and this may be reflected in the choice of ㅁ [m] plus ㅇ (from Phagspa [w]) as the elements of hangul ᇢ. Not only is the series ᇢᇦᇴ analogous to Phagspa, but here we may have a second example of a letter composed of two elements to represent two regional pronunciations, m and w, as we saw with ᇰ for ng and null. Secondly, most of the basic hangul letters were originally simple geometric shapes. For example, ㄱ was the corner of a square, ㅁ a full square, ㅅ was a caret-like Λ, ㅇ was a circle. In the Hunmin Jeong-eum, before the influence from Chinese calligraphy on hangul, these are purely geometric. However, ㄷ was different. It wasn't a simple half square, like we might expect if Sejong had simply created it ex nihilo. Rather, even in the Hunmin Jeong-eum, it had a small lip protruding from the upper left corner. This lip duplicates the shape of Phagspa d [t], and can be traced back to the Tibetan letter d, ད. Vocalic design The seven basic vowel letters were not taken