A* or A star may refer to: A* search algorithm, a pathfinding algorithm used in computing A*, the highest grade in examination systems such as the GCE Advanced Level A*STAR, the Singapore Agency for Science, Technology and Research AStar, the Eurocopter AS350 Écureuil helicopter Class A star, a star of spectral class A Sagittarius A*, a radio source at the center of the Milky Way, believed to be a supermassive black hole See also Astar (disambiguation)