Lightsaber

A lightsaber, (PROSE: The Mystery of the Haunted Cottage) (alternatively spelled light saber, (COMIC: Return of the Volsci), light sabre, or light-sabre) was a weapon from Star Wars. (PROSE: The Scarlet Empress)

Space World promoted light-sabre duels with the Robot of Death. (PROSE: The Paradise of Death, AUDIO: The Paradise of Death)

While in the Hypernet, the Seventh Doctor's umbrella became a laser sword and Ace called it a "light-sabre-umbrella". (AUDIO: Revenge of the Swarm)

Sam Jones once called her torch a "fake light sabre". (PROSE: The Scarlet Empress)

As a kid, Richard made a "ghost detector" with an oscilloscope, switches, and lights from a toy light sabre. (PROSE: The Sleep of Reason)

When Trix MacMillan had a sub-space distress flare pointed at her, she thought a light sabre might shoot out of it. (PROSE: To the Slaughter)

Rose Tyler joked that the samurai at the Battle of Minatogawa could end up fighting with light sabers if they found the alien tech from the Volsci ship. The Ninth Doctor responds that George Lucas is a genius. (COMIC: Return of the Volsci)

On a planet imagined by a Ch'otterai, Martha Jones asked Rapunzel if she had a lightsaber to defend herself from Dracula. (PROSE: The Mystery of the Haunted Cottage)

Behind the scenes
Destrii wielded two green convection rods like lighsabers in the comic story The Flood.