Lugal is the Sumerian term for "king, ruler". It was one of several Sumerian titles that a ruler of a city-state could bear (alongside en and ensi, the exact difference being a subject of debate). The sign eventually became the predominant logograph for " King" in general. In the Sumerian language, lugal is used to mean an owner (e.g. of a boat or a field) or a head (of a unit such as a family).