I'm not sure about "pause", but Unicode has had U+25B6 BLACK RIGHT-POINTING TRIANGLE for "play" for some time, and Unicode 6.0 introduces U+23E9 BLACK RIGHT-POINTING DOUBLE TRIANGLE for "fast-forward" and U+23EA BLACK LEFT-POINTING DOUBLE TRIANGLE for "rewind".
I'm not sure about "pause", but Unicode has had U+25B6 BLACK RIGHT-POINTING TRIANGLE for "play" for some time, and Unicode 6.0 introduces U+23E9 BLACK RIGHT-POINTING DOUBLE TRIANGLE for "fast-forward" and U+23EA BLACK LEFT-POINTING DOUBLE TRIANGLE for "rewind".