One: Riba al-Fa l (i.e. an increase in quantity). This means that the two items exchanged in a particular deal are of the same type but the quantity of one of them is more than the other.
Two: Riba al-Nas’ah (i.e. increase for a delay). This refers to an additional quantity of one of the exchanged items in return for delayed payment, or in return for delayed possession in the sale of two kinds that share the reason applicable to Riba al-Fadhl when one of them is not money.