What is SIU?

SIU can refer to several different things, so without more context, it's difficult to provide a precise explanation. It commonly stands for Special Investigations Unit, which is a department within insurance companies or other organizations that investigates suspicious claims or activities to detect fraud or other wrongdoing. It can also stand for Student Information Unit/System in educational contexts, or sometimes be an acronym for a specific organization or initiative. More context is needed to provide the accurate explanation.