Difference Between In and On with Comparison Chart Key outfit of the night heart meaning is a phrase used to represent an attire that is worn during the evening or for special occasions. symbolizes love, passion, and intimacy. Therefore, an ootn showcases an trendy and captivating attire that reflects one's love for fashion and enjoys the nighttime vibe. Wearing an ootn can boost one's confidence, make an impression, and display sophistication and charm. Whether it's a glamorous dress or a chic suit, the ootn will ensure that you stand out and leave a lasting impression at any night event.