The term 'Sigh of Contentment' is a phrase used to describe the sound or feeling of relief and satisfaction. The crossword solutions for this term are AHH (3 letters), AH (2 letters), and AAH (3 letters). These words are all onomatopoeic, meaning they imitate the sound of a sigh. AHH is a longer, more drawn out sound, while AH and AAH are shorter and more abrupt. All three words can be used to express a sigh of contentment.