Van Dyne

A woman named Van Dyne was known to the Doctor by their twelfth incarnation. He said that a magnifying glass was needed to see her. (COMIC: Clara Oswald and the School of Death)

Behind the scene
This is a reference to the Wasp (Janet van Dyne) from Marvel Comics. The Doctor did cross paths with superheroes from the Marvel universe in COMIC: Party Animals and The Incomplete Death's Head, making this a feasible occurrence.