Years ago I was delivering a sailboat and took a lighting
strike that did a fair amount of damage.
We had the boat hauled for a survey
and I remember that as the bottom paint
dried, it revealed the surface of the hull
had a patterning of what I called "little lightning
bolts" etched into the surface.
Although the entire hull
had the little lighting
bolts all over it, they seemed to be more heavily concentrated in areas where there was metal near the hull, such at the three points of a danforth anchor
lying under a quarter berth or where the engine
mounts were located.
Today, after many years of not knowing they had a name, I found out they are called Lichtenberg Figures. Now you know too!