CJK stands for Chinese, Japanese, and Korean, referring to the shared ideographic character system. In Unicode, these are assigned code points as CJK Unified Ideographs, with approximately 20,000 characters in the Basic Multilingual Plane (BMP) from U+4E00 to U+9FFF, and over 90,000 characters including extension areas.

Han Unification is the core design principle of CJK in Unicode. Characters from simplified Chinese, traditional Chinese, Japanese kanji, and Korean hanja that share the same historical origin are assigned the same code point. For example, the character "直" has slightly different glyphs across Chinese, Japanese, and Korean, but in Unicode it is the same U+76F4. Since the displayed glyph depends on the font, accurately specifying the HTML lang attribute is crucial for browsers to select appropriate fonts. search hair removal device on Amazon explain the system.

CJK characters are displayed at full width and consume 3 bytes per character in UTF-8 or 2 bytes in UTF-16 (within BMP). The same 100-character text would be 100 bytes in English (ASCII) but 300 bytes in Japanese (UTF-8), creating a significant gap between character count and byte count. Database capacity planning and network bandwidth estimation must account for this difference.

A defining characteristic of CJK text is the absence of spaces between words. While English uses whitespace as word delimiters, Japanese and Chinese have no such separators. This means search engine indexing, line breaking, and word counting require morphological analysis (such as MeCab for Japanese) or N-gram approaches.

Han Unification has faced criticism. The Japanese glyph for "骨" differs from the Chinese glyph, yet they share the same code point. To use different glyphs within the same document, CSS font-family control or font feature settings are needed. Unicode's IVS (Ideographic Variation Sequence) partially addresses this issue.

For character counting, CJK characters carry more information per character, requiring fewer characters than English to convey the same content. On social media with character limits, CJK language users can pack more information into a single post compared to English users. explore love lotion on Amazon cover language-specific challenges and solutions.