Petrichor



Petrichor, as defined by the TARDIS Matrix when inhabiting the body of Idris, was the smell of dust after rain. It was used by the TARDIS as part of the password to open a back-up TARDIS control room, which she gave to Rory Williams through a telepathic link. (TV: The Doctor's Wife)

Sarah Jane Smith mentioned to the Fourth Doctor that she loved "that fresh smell just after a rain shower". (TV: The Android Invasion)

Petrichor was also the name of a fragrance for which Amy Pond posed as a model in an advertisement, the slogan for which was "For the girl who's tired of waiting". An advertisement for Petrichor, which featured a photo of Amy, was displayed in Sanderson & Grainger where the Eleventh Doctor was working in the toy department. (TV: Closing Time)

In The Doctor's Wife (TV story) Petrichor was part of the password used by Amy to enter a locked TARDIS control room: “Crimson, eleven, delight, petrichor”. The password had to be thought, rather than spoken.