The Missionary Romanization System Used for Certain Southern Min Dialects The following charts show the missionary romanization system (MRS) that is widely used to transcribe the dialect of Xiamen and other closely related dialects, such as those of Zhangzhou, Quanzhou, Tongan, and Taiwan. This group of dialects is often referred to collectively as Hokkien or Holo. I'll use the term Hokkien ...