Silver Lady

The "" was a name given by Charles Babbage to a figurine, that could summon the Kasaavin.

It was a gift to Charles, delivered by a young man, who said it was a "token of appreciation from his master". According to Charles Babbage it was "a revolutionary piece of engineering", though he thought it to be as much for decoration as for purpose, "like all great ladies". He told the Thirteenth Doctor that it moves and, on occasion, projects. These "projections" turned out to be the Kasaavin. The Doctor came into conclusion, that this machine is used to stabilize the Kasaavin in this world. The Doctor used her sonic screwdriver on the "Silver Lady" to summon a Kasaavin so that it would bring her back to the 21st century. Before the Doctor touched the Kasaavin, Ada grabbed her hand, and they both were brought to Paris in 1943. (TV: Spyfall)