The term 'Cause of Astonishment' can be summarized as a MARVEL, which is a six-letter word. MARVEL is defined as an event or object that causes wonder, admiration, or astonishment. It is often used to describe something extraordinary or unexpected. Marvels can range from natural phenomena such as a rainbow or a meteor shower to man-made creations such as a skyscraper or a bridge. Marvels can also refer to people who have achieved something remarkable or inspiring.