As character names:

U+309C KATAKANA-HIRAGANA SEMI-VOICED SOUND MARK 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 130, hex 0x82, octal \202, binary 10000010
This is continuation byte 1, expecting 1 more.

Byte number 3 is decimal 156, hex 0x9C, octal \234, binary 10011100
This is continuation byte 2, expecting 0 more.

U+309C	KATAKANA-HIRAGANA SEMI-VOICED SOUND MARK
	# 0020 309A