Well you will normally see two terminologies: - Morphism (Domain, Codomain) - Arrow (Source, Target) The reason for the last one is that you may find "Arrows

Well you will normally see two terminologies: - Morphism (Domain, Codomain) - Arrow (Source, Target) The reason for the last one is that you may find "Arrows" that aren't functions. (Such as an order relationship in the Poset category)