Kodanda is the name of the bow used by Bhgavan Sri Rama to vanquish the practitioners of Adharma in the Ramayana. This bow of Sri Ram is known as the auspicious one. Usually a bow has 3 or 5 or 7 joints. But Kodanda has 9 joints.
There are also temples dedicated to Kodanda Rama especially in Telangana, Andhra Pradesh and Tamil Nadu. In such temples, Bhagavan Sri Ram is worshipped in the murti form in which he holds a bow.
It is not mentioned in the Ramayana as to how Rama came into the possession of his bow.