Attitude thrusters
From Tardis Wiki, the free Doctor Who reference
In the 26th century, Isomorph Cybermen used back-mounted zero-g attitude thrusters to fight Daleks on transolar discs in the vacuum of space. (PROSE: Heliotrope Bouquet [+]Loading...["Heliotrope Bouquet (short story)"], GRAPHIC: Dalek — Cyber War [+]Loading...["Dalek — Cyber War (illustration)"])
