what is the name of this curve I was drawing a high pass filter response ,in a polar coordinates, the function is (z+1)/z and then it is 2+2*cos(w)
the plot is 
What is the name of this plot, is it a frequency response or impulse response or some thing else.

and how to distinguish it from other curves names.
It is called a cardioid pattern. (cardioid because it looks vaguely heart-shaped)

You've shown us a polar frequency magnitude plot with the frequency given in radians. You'll notice by going counter-clockwise around the unit circle that low frequencies are attenuated while the higher frequencies are passed through.