A beach memento is a popular souvenir to take home from a beach vacation. The two crossword solutions for the term 'beach memento' are 'SHELL' (5 letters) and 'seashell' (8 letters). A SHELL is a hard, protective outer layer of an animal, such as a mollusk or crustacean, which can be found on beaches around the world. Seashells are the shells of marine mollusks, which are often collected by beachgoers as a reminder of their time spent at the beach.