Flying saucer

Flying saucers are a form of circular spacecraft which have been used by many species throughout the Universe for many millennia. "Flying saucer" has often gotten used as a joking synonym for UFO by humans in the 20th and 21st centuries

Dalek flying saucers
One of the most commonly used type of Dalek ship is their flying saucer, of which the fleet of the Dalek Empire during the Time War was composed of 10 million, including the Dalek Emperor's flagship.

The normal saucers contained about half a million Daleks each and were small and bronze-coloured, the same as colour the drone Daleks of that time. The flagship was the same colour but much larger, containing up to two million Daleks (both standard ones and black-domed ones) and could fire projectile weaponry.

At the end of the Time War, the Doctor caused all of the fleet to burn away except one, the flagship, which escaped via time travel to the 200th century (DW: Bad Wolf, The Parting of the Ways).

The Daleks also used saucers when invading other planets, such as when they tried to invade Earth between 2157 and 2167. (DW: The Dalek Invasion of Earth)

Cyberman flying saucers
The Cybermen landed on the Moonbase in a saucer-shaped craft in 2070. (DW: The Moonbase.)

Jathaa flying saucers
The Jathaa have a certain type of ship, their sunglider, which is a large, black, saucer-shaped craft and moves via a smaller rotating platform of sorts underneath. (DW: Army of Ghosts, TW: End of Days) They have a powerful weapons system, utilising five lasers that converge into one powerful beam which can disintegrate an asteroid into ash. (DW: The Christmas Invasion)