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I know LIN is Nebraska Service Center. However, when I use this website to track cases, it shows me Lin_SC and Lin_LB these two with different letters at the end. What do they represent?

Thank you.

here is the definition of lockbox. For detail, check out this document from USCIS https://www.uscis.gov/sites/default/files/document/tip-sheets/Lockbox-Filing-Tips.pdf

A service center is a place that actually people work there to process applications.

Thank you so much.
I submitted everything online, so I do not have to look at _LB stuff.