Fehu (fay-hoo) is the first rune of the first aett. It represents primordial fire, the primal fire of Muspelheim.
It is associated with domesticated cattle, a form of measurable and movable wealth. There is responsibility associated with the wealth, because cattle take care and responsibility to maintain. Wealth takes work. It also indicates exchange and barter, because the trade of livestock was a major part of pastoral life.
Visually, it is reminiscent of a wheat sheaf or grains on a stalk. It can be associated with Niord, the god associated with wealth, and also Frey and Freyja, because they are fertility deities associated with the cattle born in spring. It is interesting to note that these are all Vanir gods.
Fehu can be associated with Litha.