What is the student code?

Excuse me, could you possibly clarify what exactly is meant by the phrase "student code"? Is it a unique identifier assigned to students for various purposes, such as access control, academic tracking, or perhaps something related to financial aid or student discounts? Is it a code of conduct that students are expected to adhere to while enrolled in an educational institution? Or perhaps it's something else entirely? I'm curious to know the specifics behind this term, as it could potentially have a significant impact on the daily lives and responsibilities of students. Thank you for your time and assistance in clarifying this matter.