Atriphtaloid

An atriphtaloid, also called an atriphtothlassic curve, is type of sextic plane curve. It is given by the equation

${\displaystyle x^{4}(x^{2}+y^{2})-(ax^{2}-b)^{2}=0,}$

An atriphtaloid with a = 3 and b = 2

where a and b are positive numbers.