As character names:

U+8FFFE <not a character> character (&#x8FFFE;)

As raw characters:

򏿾

As a string of HTML entities:

&#x8fffe;

Decoder output:

Byte number 1 is decimal 242, hex 0xF2, octal \362, binary 11110010
This is the first byte of a 4 byte sequence.

Byte number 2 is decimal 143, hex 0x8F, octal \217, binary 10001111
This is continuation byte 1, expecting 2 more.

Byte number 3 is decimal 191, hex 0xBF, octal \277, binary 10111111
This is continuation byte 2, expecting 1 more.

Byte number 4 is decimal 190, hex 0xBE, octal \276, binary 10111110
This is continuation byte 3, expecting 0 more.

U+8FFFE	<not a character>