Definition from Wiktionary, the free dictionary
See also Appendix:Variations of "i"
- 이 (i), a jamo (letter) of the alphabet of the Korean writing system, hangeul; a close front unrounded vowel (IPA: [i])
Usage notes 
In the North Korean order, ㅣ (i) is the tenth vowel. In the South Korean order, it is the 21st.