👉 In physics and engineering, an eponge is a type of sponge. It is known for its shape, which resembles a large or small ball that can be easily flattened into a sphere. The name "eponge" comes from the Greek word "epsos," which means "small round thing." These objects are often used in various applications such as water filters, aquariums, and cleaning systems, where they help to remove impurities and maintain a clean environment.