As character names:

U+27EC MATHEMATICAL LEFT WHITE TORTOISE SHELL BRACKET character (⟬)

As raw characters:

⟬

As a string of HTML entities:

⟬

Decoder output:

Byte number 1 is decimal 226, hex 0xE2, octal \342, binary 11100010
This is the first byte of a 3 byte sequence.

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

Byte number 3 is decimal 172, hex 0xAC, octal \254, binary 10101100
This is continuation byte 2, expecting 0 more.

U+27EC	MATHEMATICAL LEFT WHITE TORTOISE SHELL BRACKET
	x (left black tortoise shell bracket - 2997)
	x (left white tortoise shell bracket - 3018)