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Four corner method

The Four corner method is an method of encoding Chinese characters using four numerical digits per character (in some situations, an additional digit is used). It began as a method of indexing Chinese characters in dictionaries, and was popular before the wide spread use of pinyin. It was then developed as an input method for computer.

The four digits used to encode each character are chosen according to the "shape" of the four corners of each character, i.e. the upper left, upper right, lower left and lower right corners.

Its use is not common.

See also: Chinese character encoding

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