Asides

Classic UFO shapes

While some of the newer shapes are not included in here, in particular Triangular UFOs, these are a good representation of the classically seen UFO shapes.

Gallery of common UFO shapes
Classic UFO shapes that have been reported
Classic German disc shaped UFO diagram
German disk UFO types

French poster with a few types of UFO shapes
Even the French are interested in UFOs. Here is a French poster logging a few more classic UFO shapes and sightings.
Very unofficial aircraft identification chart that deals with UFOs.
For those with a sense of humor, an unofficial UFO identification chart