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A blivet, also known as a poiuyt, devil's fork or widget, is an undecipherable figure, an optical illusion and an impossible object. It appears to have three cylindrical prongs at one end which then mysteriously transform into two rectangular prongs at the other end.
In its most common usage, the word "blivet" refers to an indecipherable figure, illustrated above. It appeared on the March 1965 cover of Mad magazine bearing the caption "Introducing 'The Mad Poiuyt' " (the last six letters on the top row of many Latin-script typewriter keyboards, right to left), and has appeared numerous times since then. An anonymously-contributed version described as a "hole location gauge" was printed in the June 1964 issue of Analog Science Fiction and Fact, with the comment that "this outrageous piece of draftsmanship evidently escaped from the Finagle & Diddle Engineering Works" (although something else called a "hole location gauge" had already been patented in 1961).
The graphic artist M.C. Escher used these types of figures as the basis for impossible three-dimensional compositions in many of his woodcut prints.
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In traditional U.S. Army slang dating back to the Second World War, a blivet was defined as "ten pounds of manure in a five pound bag" (a proverbial description of anything egregiously ugly or unmanageable); it was applied to an unmanageable situation, a crucial but substandard or damaged tool, or a self-important person. In Cormac McCarthy's All the Pretty Horses, Rawlins defines a blivet as "10 pounds of shit in a 5 pound bag". During the Vietnam War, a heavy rubber bladder in which aviation fuel or POL (petroleum, oil, and lubricants) was transported was known as a blivet, as was anything which, once unpacked, could not be replaced in its container. The usage of blivet for a fuel container is still current.
In various United States Air Force communities (e.g. Strategic Air Command), blivet may have referred to what are euphemistically called "Special Weapons" whose presence are officially neither confirmed nor denied. Usage apparently derived from the original cavalry definition.
In the United States Unmanned Aerial Systems community (specifically Shadow UAS) a blivet is a tool used to test the system's launcher to ensure proper functionality. The Shadow system's blivet weighs approximately 375 pounds (170 kg) – the same as a fully fueled Shadow 200 Tactical Unmanned Aerial Vehicle (RQ-7B). It is a green hexagonally shaped piece of iron with four mounting points.
In the US Navy during the Viet Nam area, a blivet was a modified drop tank with access panels added to allow transportation of miscellaneous articles to and from the aircraft carrier. In Naval Aviation, a blivet is the common term for an external baggage container carried on any aircraft.
Among computer programmers, a blivet refers to any embarrassing glitch that pops up during a customer demonstration. Among computer security specialists, it can refer to a denial-of-service attack performed by monopolizing limited resources that have no access controls (for example, shared spool space on a multi-user system). There are other meanings in other technical cultures; among experimental physicists and hardware engineers it may designate any random object of unknown purpose (similar to hackers' use of frob).
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