thumb|right|Fractional approximations of
thumb|right|Fractional approximations of
Milü (), also known as Zulü (Zu's ratio), is the name given to an approximation of (pi) found by the Chinese mathematician and astronomer Zu Chongzhi during the 5th century. Using Liu Hui's algorithm, which is based on the areas of regular polygons approximating a circle, Zu computed as being between 3.1415926 and 3.1415927 and gave two rational approximations of , and , which were named yuelü () and milü respectively.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).