Which term denotes the imaginary flat surface used to divide the body into sections?

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Using an imaginary flat surface to divide the body into sections is called a plane. Planes are the standard reference surfaces in anatomy; they slice through the body to describe location and relationships in a consistent way. Common examples are sagittal, coronal (frontal), and transverse (horizontal) planes, which separate left from right, front from back, and top from bottom, respectively. A line is one-dimensional and cannot partition a three-dimensional volume, a section refers to the actual cut or exposed surface after slicing, and an angle is formed by two lines, not used to divide the body into sections.