Angels are typically benevolent celestial beings that act as intermediaries between heaven and earth, especially in Christianity, Judaism, Islam, and Zoroastrianism. A representation of such a being, especially in Christianity, conventionally in the image of a human figure with a halo and wings. In Christianity, the last of the nine orders of angels in medieval angelology. From the highest to the lowest in rank, the orders are: seraphim, cherubim, thrones, dominations or dominions, virtues, powers, principalities, archangels, and angels.