The term SCI can be broken down into two parts: POLI (4 letters) and NAT (3 letters). POLI stands for Political Science, which is a field of study that focuses on the analysis of political systems, behavior, and processes. NAT stands for Natural Science, which is a field of study that focuses on the physical world and its phenomena, such as biology, chemistry, and physics. Together, these two fields of study form the basis of the term SCI, which stands for Science.