On June 24, 1947, pilot Kenneth Arnold reported seeing flying objects he could not identify. He described them using terms such as “pie-plate,” “ disc,” and “saucer.” News media reported this as Arnold seeing a flying saucer and the term stuck. The term is generally considered obsolete as it doesn't include the shapes of other such sightings of triangles, spheres, oblongs, etc. As a result, the usual modern expression is UFO or Unidentified Flying Object.