The cloud looks like a little cap to me. It gives me a sort of magical feeling like its a little protective cap over the mountain. It is obviously very special. This comes from Terry Coleman, of Etna. Therefore as you can see today the cloud does not fool many people.
Lenticular clouds are lens-shaped clouds that result from a strong wind over rugged terrain.
This strong wind flow produces a distinct up and down wave like pattern on the lee side of the mountain. The lenticular clouds tend to form at the peaks of these waves. They sometimes are so round and the edges so well defined that they resemble flying saucers. This shape indicates that there is a lack of buoyancy. The cloud gets smaller and smaller with each progressive crest as the wave motion dampens down.