The term bojjhanga is composed of bodhi + anga. Bodh denotes enlightenment — to be exact, insight concerned with the realization of the four Noble Truths, namely: the Noble Truth of suffering; the Noble Truth of the origin of suffering; the Noble Truth of the cessation of suffering and the Noble Truth of the path leading to the cessation of suffering. Anga means factors or limbs. Bodhi + anga (bojjhanga), therefore, means the factors of enlightenment, or the factors for insight, wisdom.
"Bojjhanga! Bojjhanga! Is the saying, Lord. Pray, Lord, how far is this name applicable?" queried a monk of the Buddha. "Bodhaya samvattantiti kho bhikkhu tasma bojjhanga ti vuccanti" — "They conduce to enlightenment, monk, that is why they are so called," was the succinct reply of the Master.[1]