In geometry, a hexagon (from Greek ἕξ, hex, meaning "six", and γωνία, gonía, meaning "corner, angle") is a six-sided polygon.[1] The total of the internal angles of any simple (non-self-intersecting) hexagon is 720°
Windspeed, I believe. Here's what Google says: "Saturn's pole appears as a hexagon due to a powerful jet stream in its atmosphere, where the wind speeds at different latitudes interact, creating a stable, six-sided vortex pattern"
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https://www.researchgate.net/publication/359078833_The_Tendency_of_Nature_towards_Hexagon_Shape_Formation_due_to_Minimizing_Surface_Energy
And that's just as interesting as an explanation!
Thanks for sharing the link!
https://youtu.be/mAkgUeJDgQ8?si=L8-wmsMLv1QRVp-c