Simplified Wade

Simplified Wade, abbreviated SW, is a modification of the Wade–Giles romanization system for writing Standard Mandarin Chinese. It was devised by the Swedish linguist Olov Bertil Anderson (1920–1993), who first published the system in 1969. Simplified Wade uses tonal spelling: in other words it modifies the letters in a syllable in order to indicate tone differences. It is one of only two Mandarin romanization systems that indicate tones in such a way (the other being Gwoyeu Romatzyh). All other systems use diacritics or numbers to indicate tone.