As character names:

U+1D7C7 MATHEMATICAL SANS-SERIF BOLD ITALIC PHI SYMBOL character (𝟇)

As raw characters:

𝟇

As a string of HTML entities:

𝟇

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 157, hex 0x9D, octal \235, binary 10011101
This is continuation byte 1, expecting 2 more.

Byte number 3 is decimal 159, hex 0x9F, octal \237, binary 10011111
This is continuation byte 2, expecting 1 more.

Byte number 4 is decimal 135, hex 0x87, octal \207, binary 10000111
This is continuation byte 3, expecting 0 more.

U+1D7C7	MATHEMATICAL SANS-SERIF BOLD ITALIC PHI SYMBOL
	# <font> 03D5 greek phi symbol