Cayley's sextic

Cayley's sextic

[′kā·lēz ′sek·stik]
(mathematics)
A plane curve with the equation r = 4 a cos3(θ/3), where r and θ are radial and angular polar coordinates and a is a constant.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.