U+F904 "滑" CJK Compatibility Ideograph-# Unicode Character

U+F904 "滑" CJK Compatibility Ideograph-# is part of the Compatibility Ideographs block, a collection of characters included in Unicode to provide round-trip compatibility with earlier East Asian character encodings, such as those used in older Japanese, Chinese, or Korean text systems. This specific ideograph corresponds to the standard CJK Unified Ideograph U+6ED1 (滑), which means "slippery" or "smooth" in various East Asian languages. The U+F904 version is a duplicate or variant form that preserves a distinct coding point from legacy standards, so that documents using those older systems can be converted into Unicode without loss of information. While visually identical to its unified counterpart, it is not typically used in modern text entry or composition, serving instead as a historical compatibility artifact.