This is sphere has structure that is called Gyroid.
it's looks like organic structure but it can describe in mathematically.
it's described in below implicit function.

sin(x)*cos(y)+sin(y)*cos{z)+sin(z)*cos(x)=0

https://en.wikipedia.org/wiki/Gyroid

This shape made by intersection of sphere and gyroid.
And also added small torus(eyelet) for some purpose.
if you through thin chain or something to a hole of torus,
it use as a key chain, pendant, etc.

I made this using ABS with no support (base only) ,
and torus to be up orientation.