Proper noun
Tongyong Pinyin
A system of romanization for Mandarin Chinese developed and implemented in the Republic of China (Taiwan) in the 1990s.
In Tongyong Pinyin a ring is written over the vowel instead. Source: Internet
Most areas of Taiwan adopted Tongyong Pinyin, consistent with the national policy. Source: Internet
This also was dual-script, albeit using the Tongyong Pinyin scheme. Source: Internet
Tongyong Pinyin was made the official system in an administrative order that allowed its adoption by local governments to be voluntary. Source: Internet