Antipodal points refer to the two points that are diametrically opposite to each other on a sphere. Synonyms for antipodal points include antipode, opposite points, antipodal vertices, and antipodal pairs. These terms are often used interchangeably in geography, navigation, and astronomy to denote points that are exactly opposite each other. Antipodal points are important in terrestrial magnetism, seismology, and geodesy where they are used to determine and study the Earth's interior and structure. In everyday language, antipodal points can be used to refer to two people or things that are completely opposite or diametrically opposed to each other.