The Flag of the Republic of China (traditional Chinese: 中華民國國旗; simplified Chinese: 中华民国国旗; pinyin: Zhōnghuá Mínguó Guóqí), a state commonly known as Taiwan.
The flag of Taiwan was first used in mainland China by the Kuomintang (KMT, the Chinese Nationalist Party) in 1917 and was made the official flag of the ROC in 1928. It was enshrined in the 6th article of the Constitution of the Republic of China when it was promulgated in 1947. Since 1949, the flag is mostly used within Taiwan where the Republic of China relocated after having lost the Chinese Civil War to the Communists.
In Chinese, the flag is commonly described as Blue Sky, White Sun, and a Wholly Red Earth (traditional Chinese: 青天, 白日, 滿地紅; simplified Chinese: 青天, 白日,满地红; pinyin: Qīng Tiān, Bái Rì, Mǎn Dì Hóng) to reflect its attributes. Wikipedia