Editing Extended Unix Code (section)

{{Short description|System of East Asian character encodings}}
{{Technical|date=March 2023}}
'''Extended Unix Code''' ('''EUC''') is a multibyte [[character encoding]] system used primarily for [[Japanese language|Japanese]], [[Korean language|Korean]], and [[simplified Chinese characters|simplified Chinese (characters)]].

The most commonly used EUC codes are [[variable-width encoding|variable-length encodings]] with a character belonging to an {{nowrap|[[ISO/IEC 646]]}} compliant coded character set (such as [[ASCII]]) taking one byte, and a character belonging to a 94×94 coded character set (such as {{nowrap|[[GB 2312]]}}) represented in two bytes. The [[EUC-CN]] form of {{nowrap|GB 2312}} and [[EUC-KR]] are examples of such two-byte EUC codes. [[EUC-JP]] includes characters represented by up to three bytes, including an initial {{ctrl|SS2|shift code}}, whereas a single character in [[EUC-TW]] can take up to four bytes.

Modern applications are more likely to use [[UTF-8]], which supports all of the glyphs of the EUC codes, and more, and is generally more portable with fewer vendor deviations and errors. EUC is however still very popular, especially [[EUC-KR]] for South Korea.<!-- North Korea has 100% UTF-8 use on the world-facing web; how much [[KPS 9566]] is used on the country-internal network is a matter of speculation. -->