Flying saucer

Flying saucers are a form of disc-shaped spacecraft which have been used by many species throughout the Universe for many millennia. "Flying saucer" was often used as a joking synonym for UFOs (in particular as a reference to alien spacecraft) by humans in the 20th and 21st centuries, due to the large number of races that used them.

Dalek flying saucers

Post-Time War Dalek saucers swarm around Satellite Five, preparing for an invasion of Earth in the year 200,100.

One of the most commonly used type of Dalek ship was their flying saucer, of which the fleet of the Dalek Empire during the Time War was composed of about ten million, including the Dalek Emperor's flagship.
The normal saucers contained about two thousand Daleks each and were small and bronze-coloured, the same colour as 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 fell through time to the 200th century, and rebuilt 200 ships of his fleet and half a million of his Daleks. (DW: Bad Wolf, The Parting of the Ways)

The pre-Time War Daleks also used saucers when invading planets, such as when they tried to invade Earth. (DW: The Dalek Invasion of Earth)

Cyberman flying saucers

The Cybermen used a saucer-shaped landing craft to land on the moon in 2070. (DW: The Moonbase)

Jathaa sungliders

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). When the Cardiff rift fractured, mixing time periods, Jathaa ships appeared and hovered over the Taj Mahal. (TW: End of Days) They have a powerful weapons system, utilising five energy beams that converge into one powerful beam which distintegrated the Sycorax asteroid ship into ash. (DW: The Christmas Invasion)