Petrichor
From Tardis Wiki, the free Doctor Who reference
Petrichor was a fragrance company that Amy Pond worked for as a model. Its slogan was "For the girl who's tired of waiting." (DW: Closing Time)
Idris used the word "Petrichor" as part of the key to open a back-up TARDIS control room. Before she gave it to Rory, she explained it was the scent of dust after the rain. (DW: The Doctor's Wife)
