As character names:

U+3018 LEFT WHITE TORTOISE SHELL BRACKET character (〘)

As raw characters:

〘

As a string of HTML entities:

〘

Decoder output:

Byte number 1 is decimal 227, hex 0xE3, octal \343, binary 11100011
This is the first byte of a 3 byte sequence.

Byte number 2 is decimal 128, hex 0x80, octal \200, binary 10000000
This is continuation byte 1, expecting 1 more.

Byte number 3 is decimal 152, hex 0x98, octal \230, binary 10011000
This is continuation byte 2, expecting 0 more.

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