Board Thread:News and Announcements/@comment-24129585-20170125172221/@comment-24577221-20170125175742

It means "mystery" or "puzzle".

In 1939, Winston Churchill described Russia as "a riddle, wrapped in a mystery, inside an enigma".

The "Enigma Machine" was a device used from the 1920s to the early 1940s to encrypt text, notably by the Germans in World War II. The story of how the encrypted messages were decrypted is pretty interesting.

The silhouette in that image looks quite Wubbox-like.