In I. M. Diakonoff's The Rise of the Despotic State in Ancient Mesopotamia (1956), I encountered the term sag-sug or sa^12 - tu^18 in the context of a list of aristocratic class-constituents in Sumer. The author doesn't clarify its meaning, and I'm having difficulty finding it in the Pennsylvania Sumerian Dictionary Project.
Does anyone here know what it means?
SAG-SUG were, I think, a type of official, sometimes described as a "surveyor" or "field register" whose duties seem to have included maintaining official records related to property, including both real estate and movable property belonging to the local government.
DISCLAIMER: This answer is brought to you by the power of Google-Fu and I am not by any stretch of the imagination an expert on Ancient Mesopotamia.