Reflectional symmetry, also known as line symmetry or mirror symmetry, occurs when an object can be divided into two identical halves that are mirror images of each other. This means that if you were to draw a line, called the line of symmetry, through the object, one side would be a perfect reflection of the other. Common examples include the letter A and the shape of a butterfly. Many natural and man-made objects exhibit reflectional symmetry. For instance, the human face often displays this type of symmetry, where one side mirrors the other. In art and design, reflectional symmetry is frequently used to create balance and harmony, as seen in the works of artists like M.C. Escher.