Schematic symbol for a flux capacitor?

[vk3yedotcom]

Does one exist?

If not, may I suggest a version of

https://upload.wikimedia.org/wikipedia/commons/b/b3/Screenshot_Recursion_via_vlc.png

The recursive nature of the above (as explained at http://analgorithmaday.blogspot.com.au/2011/01/recursionfibonacci-series.html ) would, I think, be perfect.