As character names:

U+FB01 LATIN SMALL LIGATURE FI character (fi)

As raw characters:

fi

As a string of HTML entities:

fi

Decoder output:

Byte number 1 is decimal 240, hex 0xF0, octal \360, binary 11110000
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 172, hex 0xAC, octal \254, binary 10101100
This is continuation byte 2, expecting 1 more.

Byte number 4 is decimal 129, hex 0x81, octal \201, binary 10000001
This is continuation byte 3, expecting 0 more.

U+FB01	LATIN SMALL LIGATURE FI
	# 0066 0069