Reflection symmetry, also known as mirror symmetry, occurs when one half of an object is a mirror image of the other half. This means that if you were to draw a line, called the line of symmetry, through the object, both sides would match perfectly. Common examples include the shape of a butterfly or the human face, where each side is similar but reversed. In mathematics, reflection symmetry can be found in various geometric shapes, such as squares, circles, and triangles. Artists often use reflection symmetry in their work to create balance and harmony. Understanding this concept helps in fields like design, architecture, and nature studies.