Imaginary numbers

This book sounds great:

"Inspired by the playful algebraist André Weil, brother of the philosopher Simone, the group adopted the mustachioed officer's name in 1930 for no better reason than that they thought it sounded funny."

—Alexander Masters, "The many in the one," TLS (a review of Amir D. Aczel's The Artist and the Mathematician: The story of Nicolas Bourbaki, the genius mathematician who never existed)