It's true - they're a ... oh, what's that beautiful shape
called... well, they're
[1]
https://en.wikipedia.org/wiki/Borromean_rings - but it shows
up in a lot of places.* It might be a trinity knot?* all I can
remember is the rings.* Oh!* See:
[2]
https://en.wikipedia.org/wiki/Efimov_state for the graphic on
the Halo Effect - I made that - it's a good example of 'three'
building on each other for exponential growth.
References
Visible links
1.
https://en.wikipedia.org/wiki/Borromean_rings
2.
https://en.wikipedia.org/wiki/Efimov_state