"Penny sized" refers to an object or area that is approximately the same diameter as a U.S. penny, which measures about 1.9 centimeters (0.75 inches) across. This term is often used in various contexts, such as describing small items, blemishes, or even areas of skin in medical discussions. In everyday language, saying something is "penny sized" helps convey its smallness in a relatable way. For example, a penny can serve as a visual reference for size, making it easier for people to understand how small or large an object is without needing precise measurements.