Hanyu Pinyin, what most people mean when referring to pinyin.

Yale Romanization, four romanization systems of Asian languages (Mandarin, Cantonese, Korean, and Japanese) created during World War II for use by United States military personnel. While this is a commonly encountered form of "pinyin", it does not use the word in the name.

Pinyin (Chinese: 拼音; pinyin: pīnyīn) is a system of romanization for the Chinese language, where pin means "spell" and yin means "sound". It can refer to several transcription systems for Chinese:

Tongyong Pinyin, a derivative of Hanyu Pinyin created in the late 1990s in the Republic of China (Taiwan).

Weituoma Pīnyīn (Wēituǒmǎ Pīnyīn), the Chinese name for the Wade-Giles system of Mandarin language romanization.

Standard Cantonese Pinyin, a standard romanization of Cantonese used in Hong Kong.

Pinyin is also a language spoken in Cameroon, of which ISO 639-3 code is pny. Definition in Ethnologue