Final answer:
Measurement and Signature Intelligence (MASINT) is the intelligence discipline that uniquely informs, complements other intelligence sources, and cues sensors to identify targets.
Step-by-step explanation:
The intelligence discipline that provides unique intelligence information, complements intelligence derived from other sources, and is often used for cueing other sensors to potential targets of interest is Measurement and Signature Intelligence (MASINT). MASINT is a technical collection discipline that detects, tracks, identifies or describes the signatures (distinctive characteristics) of fixed or dynamic target sources. This form of intelligence often includes radar, acoustics, and nuclear intelligence among other technical capabilities. It plays a crucial role in using intelligence services to defeat potential threats by not only providing information on its own but also by helping direct the focus of other intelligence collection methods, such as Signals Intelligence (SIGINT) and Geospatial Intelligence (GEOINT).