What is the name of the Doctor's multipurpose tool?

The Doctor’s multipurpose tool is the sonic screwdriver. It is a handheld device that uses sound-wave technology to unlock doors, disable machinery, scan objects, and perform many other technical tasks in Doctor Who.

The tool first appeared in the 1968 serial “Fury from the Deep,” during the Second Doctor’s era. Its exact capabilities have varied over time, but it is generally presented as an instrument for manipulating technology rather than a conventional weapon. The Doctor frequently uses it as a fast solution when faced with locked or unfamiliar equipment.

The sonic screwdriver does have limits. It cannot reliably operate on wood, and some villains or technologies are resistant to it. The Doctor has also used different versions, including a sonic pen and other sonic devices. It is commonly confused with the sonic blaster, which is a weapon, or with the Doctor’s later sonic sunglasses.