The following is a list of abbreviations commonly used in the case status system:

I-140: Immigrant Petition for Alien Worker
PERM: Step 1:Prevailing wage Step 2: Recruitment Step 3: PERM Filed
MTR: Motion to Reconsider

EAD: Employment Authorization Document
AOS: Adjustment of Status
EB: Employment Base EB2: Employment Base Category 2 or EB3 Employment base category 3
PD: Priority Date
EOS: Extension of Status
COS: Change of Status
DOL: Department of Labor

For residence case status: PERM has 3 steps: Prevailing wage, Recruitment, pending w/DOL