The term "line of symmetry" refers to a line on which a figure can be folded into two equal halves. In geometry, this term is widely used to explain the symmetry of shapes. However, there are several synonyms for this term, such as axis of symmetry, mirror line, and reflection line, which convey the same meaning. The axis of symmetry is a line that divides the shape into two symmetrical halves, while a mirror line is a reflective surface or plane that reflects an object in a symmetrical way. The reflection line is a line that reflects an image in a symmetrical way. These synonyms are useful in different contexts and can be used interchangeably to enhance the understanding of geometric concepts.