Akilathirattu Ammanai (Tamil: அகிலத்திரட்டு அம்மானை; from akilam (world) + thirattu (collection) + ammanai (ballad)), also called Thiru Edu (venerable book), is the main religious book of the Southern Indian Ayyavazhi, officially a branch of Hinduism. The title is shortened as Akilam. This is the largest Ammanai work. it has more than 15,000 verses.