Letters are 6 vowels of modern Korean: letters in red colour are regular diphthongs. But there are many other diphthongs! --아흔(A-heun) 17:03, 21 Jun 2005 (UTC)
The above vowel chart is very lacking, and ought to be excluded from this entry. It lacks the diphthongs that 아흔 alluded to, but more importantly it excludes the vowels ㅔ and ㅐ. These vowels are monophthongs — discrete, glideless vowel phonemes. -- Prof. S. Walker
The table shows the six basic Hangeul Jamo vowels (ᅡ,ᅥ,ᅩ,ᅩ and ᅳ,ᅵ) with the extensions (ᅣ,ᅧ,ᅭ,ᅲ).
All the other Hangeul Jamo vowels are compositions of these basic vowels.
Just the name of this file is misleading, it should better be something like "Basic Jamo vowels". -- sarang♥사랑