What is the meaning of bilateral at classification level of organisms?

In the classification of organisms, "bilateral" refers to bilateral symmetry, a characteristic where an organism can be divided into two mirror-image halves along a single plane. This symmetry is typical of many animals, including most vertebrates, where the left and right sides are nearly identical. Bilateral symmetry often correlates with a more complex body structure and the development of a head (cephalization), allowing for greater mobility and directional movement. It's a key trait in the classification and evolutionary understanding of various animal groups.