A flying saucer (also referred to as a flying disc) is a type of described flying craft with a disc or saucer-shaped body, commonly used generically to refer to any anomalous flying object. The term was coined in 1947 but was officially supplanted by the United States Air Force in 1952 with the broader term unidentified flying objects or UFO's. Early reported sightings of unknown "flying saucers" usually described them as silver or metallic, sometimes reported as covered with navigation lights or surrounded with a glowing light, hovering or moving rapidly, either alone or in tight formations with other similar craft, and exhibiting high maneuverability. While disc-shaped flying objects have been interpreted as being sporadically recorded since the Middle Ages, the first highly publicized sighting by Kenneth Arnold on June 24, 1947, resulted in the creation of the exact term by U.S. newspapers. Although Arnold never specifically used the term "flying saucer", he was quoted at the time saying the shape of the objects he saw was like a "saucer", "disc", or "pie-plate", and several years later added he had also said "the objects moved like saucers skipping across the water." Both the terms flying saucer and flying disc were used commonly and interchangeably in the media until the early 1950s. Arnold's sighting was followed by thousands of similar sightings across the world. Such sightings were once very common, to such an extent that "flying saucer" was a synonym for UFO through the 1960s before it began to fall out of favor. More recently, the flying saucer has been largely supplanted by other alleged UFO-related vehicles, such as the black triangle. The term UFO was, in fact, invented in 1952, to try to reflect the wider diversity of shapes being seen. However, unknown saucer-like objects are still reported, such as in the widely publicized 2006 sighting over Chicago-O'Hare airport. Many of the alleged flying saucer photographs of the era are now believed to be hoaxes. The flying saucer is now considered largely an icon of the 1950s and of B-movies in particular, and is a popular subject in comic science fiction. Beyond the common usage of the phrase, there have also been man-made saucer-like craft. The first flying disc craft was called the Discopter and was patented by Alexander Weygers in 1944. Other designs have followed, such as the American Vought V-173 / XF5U "Flying Flapjack", the British GFS Projects flying saucer, or the British "S.A.U.C.E.R." ("Saucer Aircraft Utilising Coanda Effect Reactions") flying saucer, by inventor Alf Beharie.