The unit used to measure latitude and longitude are degrees (°).
Latitude is measured in degrees north (N) or south (S) of the equator, with the equator itself being at 0° latitude. Lines of latitude run parallel to the equator, and values range from -90° (South Pole) to +90° (North Pole).
Longitude is measured in degrees east (E) or west (W) of the Prime Meridian, which runs through Greenwich, England, and is designated as 0° longitude. Lines of longitude, also known as meridians, run from the North Pole to the South Pole, and values range from -180° (180°W) to +180° (180°E).