Answered By: Library Reviewer Last Updated: May 23, 2017 Views: 69
Those abbreviations refer to the different stack levels and sub levels of the Library:
SL1 = Stack Level 1
LL1 = Lower Level 1
SL2 = Stack Level 2
SL3 = Stack Level 3
LL2 = Lower Level 2
Use our library map and tour for more information about the layout of the Library.