U+FFFE "￾" Specials Unicode Character

U+FFFE "￾" Specials is a noncharacter permanently reserved for internal use and specifically designed to detect byte order in text data, as its name and position within the "Specials" block indicate. Unlike most encoded characters, U+FFFE is intentionally not intended for normal text interchange; instead, it serves as a byte order mark (BOM) counterpart to U+FEFF, the zero width no-break space, which when reversed in byte order becomes U+FFFE. This means that if a system receives this character unexpectedly, it signals that the text's byte serialization is in the opposite byte order from what was assumed, helping applications identify and correct endianness issues.