Romanization of Chinese () is the use of the Latin alphabet to transliterate Chinese. Chinese uses a logographic script and its characters do not represent phonemes directly. There have been many systems using Roman characters to represent Chinese throughout history. Linguist Daniel Kane wrote, "It used to be said that sinologists had to be like musicians, who might compose in one key and readily transcribe into other keys." The dominant international standard for Standard Mandarin since about 1982 has been Hanyu Pinyin, invented by a group of Chinese linguists in the 1950s including Zhou Youguang. Other well-known systems include Wade–Giles (Mandarin) and Yale romanization (Mandarin and Cantonese). There are many uses for Chinese romanization. Most broadly, it is used to provide a useful way for foreigners who are not skilled at recognizing Chinese script to read and recognize Chinese. It can also be helpful for clarifying pronunciation among Chinese speakers who speak mutually unintelligible Chinese varieties. Romanization facilitates entering characters on standard keyboards such as QWERTY. Chinese dictionaries have complex and competing sorting rules for characters and romanization systems simplify the problem by listing characters in their Latin form alphabetically. Background The Indian Sanskrit grammarians who went to China two thousand years ago to work on the translation of Buddhist scriptures into Chinese and the transcription of Buddhist terms into Chinese, discovered the "initial sound", "final sound", and "suprasegmental tone" structure of spoken Chinese syllables. This understanding is reflected in the precise Fanqie system, and it is the core principle of all modern systems. While the Fanqie system was ideal for indicating the conventional pronunciation of single, isolated characters in written Classical Chinese literature, it was unworkable for the pronunciation of essentially polysyllabic, colloquial spoken Chinese dialects, such as Mandarin. Aside from syllable structure, it is also necessary to indicate tones in Chinese romanization. Tones distinguish the definition of all morphemes in Chinese, and the definition of a word is often ambiguous in the absence of tones. Certain systems such as Wade–Giles indicate tone with a number following the syllable: ma1, ma2, ma3, ma4. Others, like Pinyin, indicate the tone with diacritics: mā, má, mǎ, mà. Still, the system of Gwoyeu Romatzyh (National Romanization) bypasses the issue of introducing non-letter symbols by changing the letters within the syllable, as in mha, ma, maa, mah, each of which contains the same vowel, but a different tone. Uses Non-Chinese Teaching spoken and