Worlds of Exile and Illusion: Rocannon's World / Planet of Exile / City of Illusions (Hainish Cycle, #1-3)

by Ursula K. Le Guin

Unless he was in one of the Places of Silence, and addressed in a certain form by an associate of his own Level, Ramarren was absolutely unable to communicate, in words or writing or mindspeech, the True Name of his world’s sun.