Sonic umbrella

owned a sonic umbrella.

History
In escaping from the Bekdel Institute with River Song, Missy used her sonic umbrella to scramble the archeologist's vortex manipulator, unscrambling it only when River agreed to take the Time Lady with her. After escaping, Missy, annoyed by River, used the umbrella to set the vortex manipulator to return River to her cell in the Stormcage Containment Facility. (AUDIO: The Bekdel Test)

She used it aboard a Mondasian colony ship during the Battle of Floor 0507. The activation controls were located at the handle end opposite the emitter at the tip. Missy had a tendency to dance with it when hearing music. It had multiple uses, namely how Missy used her umbrella to locate and call up a lift on board the Mondasian colony ship, (TV: World Enough and Time / The Doctor Falls) locate the hidden lifts and shuttles found on Floor 0507, lock said lifts to stay on the desired floor, close a metal door several feet away and could combine with the Twelfth Doctor's sonic screwdriver to create a barrier to hold a fully evolved Cyberman back while (using his laser screwdriver) and a cyber-converted Bill Potts disabled it. The umbrella could also be used as an effective melee weapon; Missy used it to strike the Doctor to the floor shortly after he gained an advantage over her younger self, and to briefly knock the Master out with a blow to the head. (TV: The Doctor Falls)

In some instances, it sounded like a sonic screwdriver (TV: World Enough and Time / The Doctor Falls) but in some others it's sound resembled a laser screwdriver. (AUDIO: Day of the Master)

Her successor gave up using both this tool and the multipurpose device in favour of returning to wielding a tissue compression eliminator.

Behind the scenes
According to the BBC art concept, the tip of the umbrella was supposed to look like a red version of the Twelfth Doctor's screwdriver lighting.