Brief History
The term Unidentified Flying Object... or 'UFO'... was first coined in the 1950s. Prior to this it was widespread, and not uncommon to hear the terms 'flying saucer' or 'flying disc', which in real terms can be misleading... as can the term UFO.
As Investigators we prefer the term 'Unidentified Aerial Phenomena' or UAP.
Identification and Classification