" Alai suddenly kissed Ender on the cheek and whispered in his ear, “Salaam.” Then, red-faced, he turned away and walked to his own bed at the back of the barracks. Ender guessed that the kiss and the word were somehow forbidden. A suppressed religion, perhaps. Or maybe the word had some private and powerful meaning for Alai alone. "

― Orson Scott Card , Ender's Game (Ender's Saga, #1)