The seven factors are
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.
Further says the Buddha, "Just as, monks, in a peaked house all rafters whatsoever go together to the peak, slope to the peak, join in the peak, and of them all the peak is reckoned chief: even so, monks, the monk who cultivates and makes much of the seven factors of wisdom, slopes to Nibbana, inclines to Nibbana, tends to Nibbana.