0xFFFE
0xFFFE is the hexadecimal representation of the 16-bit value 65534. In Unicode terminology, the corresponding code point is U+FFFE. This code point is classified as a noncharacter, meaning it is permanently reserved and not assigned to any user-visible character. Noncharacters are distinct from regular characters and are generally not intended for text interchange.
In Unicode, noncharacters include U+FFFE, U+FFFF, U+FDD0 through U+FDEF, and all code points whose final two hexadecimal
0xFFFE also has a practical role in the encoding of UTF-16. The two-byte sequence FF FE is
In summary, 0xFFFE can refer to a specific 16-bit value that corresponds to a Unicode noncharacter (U+FFFE),