As character names:

U+25BD WHITE DOWN-POINTING TRIANGLE 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 150, hex 0x96, octal \226, binary 10010110
This is continuation byte 1, expecting 1 more.

Byte number 3 is decimal 189, hex 0xBD, octal \275, binary 10111101
This is continuation byte 2, expecting 0 more.

U+25BD	WHITE DOWN-POINTING TRIANGLE
	= Hamilton operator
	x (nabla - 2207)
	x (heavy white down-pointing triangle - 26DB)
	x (alchemical symbol for water - 1F704)