Unified Ideograph

Unified Ideograph is a binary character property that identifies code points representing CJK ideographs which have been unified across China, Japan, Korea, and Vietnam into single encoded entries, rather than separate variants per region. This unification process merges historically related but visually distinct characters into one codepoint, with the property flag set only for those base ideographs in the main CJK unified blocks, excluding compatibility ideographs, extension A beyond the original standard, or supplementary planes. The property aids in text processing, font selection, and sorting by allowing systems to treat these characters as standard ideographs, while preserving regional variant information through separate variation selectors or language-tagged rendering. It is essential for correctly handling Chinese, Japanese, and Korean text, ensuring a shared core repertoire across these writing systems.