The term 'PERFORMER OFTEN TRAPPED IN A BOX' can be summarized as a MIME, which is a four-letter word. Mimes are performers who use physical gestures and body language to convey emotions and stories without the use of words. They often perform in a box or an imaginary space, creating the illusion of being trapped. Mimes have been around since ancient times, and their art form has been popularized in modern times by famous mimes such as Marcel Marceau.