Flag of the Republic of China sovereign independent country of the Republic of China (ROC) to the island of Taiwan. On the mainland, the communist forces of Mao Zedong established the People's Republic of China and adopted their own national flag. On October 23, 1954, the National Emblem and National Flag of the Republic of China Act () was promulgated by the Legislative Yuan to specify the size, measure, ratio, production, and management of the flag. While public display of the ROC flag is generally frowned upon, and may even lead to arrest in the PRC, Cambodia was the first country to outlaw it officially. In
Mainland China in English, is commonly applied by SAR governments to represent non-SAR areas of PRC, including Hainan province and coastal regions of mainland China, such as "Constitutional and Mainland Affairs" () and Immigration Departments. In the Mainland and Hong Kong Closer Economic Partnership Arrangement (as well as the Mainland and Macau Closer Economic Partnership Arrangement) the CPG also uses the Chinese characters "inner land", with the note that they refer to the "customs territory of China". In the United States' Taiwan Relations Act, the ROC-controlled islands of Quemoy and Matsu were excluded from the definition of "Taiwan". The House Foreign Affairs