TITLE: Is Adobe Acrobat's icon a special function?
QUESTION [17 upvotes]: It looks like a function in polar coordinates. 
Is it a special function ?

REPLY [2 votes]: Thanks you guys! Very grateful for this discussion. This is just what I was looking for. It's a Cinema4D Formula Object. Did a little Z tweaking to make it loop like Acrobat Logo. Apologies for my home made Z formula, kinda hacked at it. Sure there is a better solution.

$X= 300 \cdot \cos(t) \cdot (\sin(t+.5) +\cos(3t+.5))$
$Y= 300 \cdot \sin(t) \cdot (\sin(t+.5)  -\cos(3t+.5))$
$Z= 10 \cdot \cos(t) \cdot 10 \cdot \sin(t)$
TMin $=-1.571$
TMin $=1.571$