<P> While both North and South Korea claim 99% literacy, government studies show that 25% of people in the older generation in the South are not completely literate in hangul . </P> <P> The Hunminjeongeum Society in Seoul attempts to spread the use of hangul to unwritten languages of Asia . In 2009, hangul was unofficially adopted by the town of Bau - Bau, in Sulawesi, Indonesia, to write the Cia - Cia language . A number of Indonesian Cia - Cia speakers who visited Seoul generated large media attention in South Korea, and they were greeted on their arrival by Oh Se - hoon, the mayor of Seoul . It was confirmed in October 2012 that the attempts to disseminate hangul in Indonesia failed . But there are still some people that use hangul at home or co-officially . </P> <P> Hangul letters and digraphs are called jamo (자모; 字母) or natsori (낱 소리). There are 24 letters and 27 digraphs (and sometimes trigraphs) formed from these letters in the modern alphabet . Of the letters, fourteen are consonants (ja - eum 자음, 子音 "child sounds") and ten are vowels (mo - eum 모음, 母音 "mother sounds"). Five of the consonants are doubled to form the five "tense" (faucalized) consonants of Korean, while another eleven sequences are formed of two different consonants . The ten vowel letters are combined into eleven sequences for diphthongs . </P> <P> The following letters and clusters of letters are found in the modern script: </P>

How many characters are there in korean alphabet