Decipher the greeting card $( X^2 +Y^2 -1 ) ^3 - X^2 Y^3 = 0$ A friend of mine just got a rather weird congratulations card through the door 

They have zero idea what it means, I have tried graphing it and nothing spectacular comes out. Is there a standard name for this equation or does it signify anything?
Any help would be appreciated. 

http://mathworld.wolfram.com/HeartCurve.html
Have a look at the second graph here
It is a cardiod curve.
