set Language. A very high level language based on sets, designed by Jack Schwartz at the Courant Institute in the early 1970s. It was possibly the first use of {list comprehension} notation. Data types include sets (unordered collections), tuples (ordered collections) and maps (collections of ordered pairs). Expressions may include quantifiers (' for each' and ' exists' ). The first Ada translator was written in setL. See also IsetL, Proset, setL2. ["Programming With sets - An Introduction to setL", Jacob T. Schwartz et al, Springer 1986].