
A photograph taken by me of the dust jacket of the 1955 Book-of-the-Month Club printing of Grandfather Stories. Though this image is subject to copyright, its use is covered by the U.S. fair use laws because it illustrates an educational article about the book from which the cover illustration was taken. ...
Found on
http://en.wikipedia.org/wiki/Wormsign

The tell-tale sign of an advancing worm, usually ripples in the sand that are imperceptible to any eye other than that of the Fremen.
Found on
https://www.cineworld.co.uk/static/en/uk/blog/dune-glossary-of-terms
No exact match found.