What is SIS full for?

Could you please clarify what "SIS" stands for in the context you're referring to? In various fields, "SIS" can have multiple meanings, such as Student Information System, Supply Information System, or even Strategic Intelligence System. It's essential to have a clear understanding of the context in which "SIS" is being used to provide an accurate and relevant explanation. Could you elaborate on the area or industry where you've encountered "SIS"?