Lenticular Cloud
Lenticular clouds (Altocumulus lenticularis) are stationary lens-shaped clouds that form at high altitudes, normally in perpendicular alignment to the wind direction. Lenticular clouds can be separated into altocumulus standing lenticularis (ACSL), stratocumulus standing lenticular (SCSL), and cirrocumulus standing lenticular (CCSL). Due to their shape, they have been offered as an explanation for some Unidentified Flying Object (UFO) sightings.
Read more about Lenticular Cloud: Formation, Flight, Altocumulus Lenticularis Gallery
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“When I from black and he from white cloud free,
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—William Blake (1757–1827)