A nickname given to Penny, Bernadette and Amy by Sheldon in "The Egg Salad Equivalency" when he was seeking advice on what to do about Alex after she starts hitting on Leonard. He uses fake names, but just ends up making Penny furious at Alex AND Leonard since in his naivety everyone knows who he is talking about.
Amy, Bernadette and Penny's reaction to their 'Sheldon Cooper's Council of Ladies' t-shirts
Sheldon presents Penny, Bernadette and Amy with their t-shirts