Final answer:
The centerpiece you are referring to is called a horn of plenty or cornucopia. It is often filled with fruits and flowers as decorative elements for special occasions or celebrations.
Step-by-step explanation:
The centerpiece known as the "horn of plenty" filled with fruits and flowers is commonly referred to as a "cornucopia." The term has its origins in Greek mythology, where the cornucopia, or Horn of Amalthea, is a symbol of abundance and prosperity. The horn, typically depicted as a large, curved vessel overflowing with a bountiful harvest, represents the horn from the goat Amalthea, which nourished the infant Zeus. In various cultural and artistic contexts, the cornucopia has become a symbol of plenty, harvest, and prosperity, making it a popular choice as a decorative centerpiece during festive occasions and celebrations, especially around Thanksgiving in many Western cultures.