Saalok is the white moderate sized moon orbiting Aiur. It was sometimes referred to as the "White Circle of Night" by the Shelak Tribe during the Aeon of Strife. Saalok appears to possess a breathable atmosphere, and is unique in that it is an almost mathematically perfect sphere, a property no other world possesses to the knowledge of the protoss. Throughout their history, the protoss have revered Saalok, some believing it was "placed" there. The moon's perfect symmetry inspired the creation of the Zealous Round, the symbol of the Zealot Order.