Yi, as in Yi Dynasty, spelled in Hangul?
closed as too broad by Vladhagen♦ Apr 1 '18 at 5:00
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It's '이'. This is one of the Hangul representations of the Hanja character 李. This is the same character as the modern name anglicised as 'Lee'.
If you're referring to the Joseon Dynasty, 조선 왕조 is the most common name. You can also say 이씨 조선 or 이씨 왕조, in contrast to the 김씨 조선 which is north korea.