As character names:

U+3007 IDEOGRAPHIC NUMBER ZERO character (〇)

As raw characters:

〇

As a string of HTML entities:

〇

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 135, hex 0x87, octal \207, binary 10000111
This is continuation byte 2, expecting 0 more.

U+3007	IDEOGRAPHIC NUMBER ZERO
	x (combining enclosing circle - 20DD)
	x (white circle - 25CB)
	x (large circle - 25EF)