The term 'CONTENTED SOUND' can be described by four different words, all of which are onomatopoeic. PURR is a sound made by cats and other animals, usually when they are content or happy. AHH and AAH are both sounds of contentment or pleasure, often used to express appreciation or admiration. SIGH is a sound of relief or satisfaction, often used to express contentment. Finally, MURMUR is a low, continuous sound, often used to describe a contented atmosphere.