The Earth is covered with millions of coordinates, but none is as intriguing as 0° latitude and 0° longitude. This unique intersection, where the equator meets the Greenwich meridian, seems abstract on a map, but it hides a fascinating story and unexpected uses. Between historical choices, mapping errors, and modern oceanic monitoring, this point on the globe is both symbolic and practical, and deserves closer attention. The origin of the coordinates: a historical challenge. Before the adoption of a universal system, maritime navigation was a real challenge. Each country chose its own prime meridian. France used the Paris meridian, China used the Beijing meridian, and other nations imposed their own references. This diversity complicated the reading of maps and the planning of international maritime routes. The situation changed in 1884, during the International Meridian Conference in Washington. Astronomers and representatives from 25 countries gathered to determine a universal prime meridian. The Royal Observatory in Greenwich, London, was chosen, partly because it passed mainly over water, facilitating its adoption for navigation. Since then, the longitude 0° has been fixed at Greenwich, while the latitude 0° naturally corresponds to the equator. The coordinate 0,0: a lost point in the ocean. On a physical map, the coordinate 0,0 is located in the Gulf of Guinea, off the western coast of Africa, in the eastern tropical Atlantic Ocean. There is no land at this location: the point is in the middle of the ocean, far from any habitation. However, in the digital world, this place is often represented by a surprising curiosity: Null Island. This fictional island does not exist in reality. It was invented by cartographers and geographers to signal geocoding errors. Digital mapping systems, which convert addresses into coordinates, often return incorrect data to 0,0. This can result from typographical errors, non-existent addresses, or software bugs. To visualize these anomalies, cartographers have drawn Null Island on maps, creating a humorous representation of an imaginary place within a square meter. Although the island is an invention, it plays a practical role in the world of cartography and geolocation. The errors that appear at 0,0 allow specialists to quickly identify misgeocoded data and improve location systems. Null Island has thus become a symbol of how technology and cartography combine to manage enormous volumes of geographic data. A real scientific function in the middle of the ocean. Beyond its humorous dimension, the point 0,0 hosts an isolated scientific buoy, called Station 13010 – Soul. This buoy is part of the PIRATA (Prediction and Research Moored Array in the Atlantic) system, a network of 17 stations that monitor oceanic and meteorological parameters, such as water temperature, wind speed, or humidity. These measurements are essential for climate models and weather forecasts, demonstrating that even a place as abstract as 0,0 has a concrete scientific importance.