| A#, A-Number | Alien Registration Number |
| AC21 | American Competitiveness in the 21st Century Act of 2000 |
| ACWIA | American Competitiveness and Workforce Improvement Act of 1998 |
| AD | Approval Date |
| ADIT | Alien Documentation, Identification and Telecommunications system |
| AILA | American Immigration Lawyers Association |
| AO | Administrative Officer |
| AOS | Adjustment of Status (485 pending) or Affidavit of Support |
| AP | Advance Parole or Assistant Professor |
| ARC | Alien Registration Card (also called Green Card or Permanent Residence Card) |
| ASC | Application Service Center (local USCIS service center) |
| BC | Birth Certificate |
| CBP | U.S. Customs and Border Protection |
| CDP | Card/Document Production |
| CFR | Code of Federal Regulations |
| CIR | Comprehensive Immigration Reform |
| CO | Certifying Officer (of DOL) |
| COS, C/S | Change of Status |
| CP | Consular Processing |
| CPT | Curricular Practical Training |
| CSC | California Service Center (= WAC) |
| DACA | Deferred Action for Childhood Arrivals |
| DHS | Depart of Homeland Security |
| DIY | Do-It-Yourself |
| DOE | Date of Entry |
| DOL | Department of Labor |
| DOS | Department of State |
| D/S | Duration of Status |
| EAC | Eastern Adjudication Center (= VSC) |
| EAD | Employment Authorization Document |
| EB | Employment-based |
| EB2C | EB2 China |
| EB2I | EB2 India |
| EB3C | EB3 China |
| EB3I | EB3 India |
| EIN | Employer Identification Number |
| ETA | Employment and Training Administration (of DOL) |
| EVL | Employment Verification Letter |
| FEIN | Federal Employer Identification Number |
| FOIA | Freedom of Information Act |
| FP | Finger Print |
| GC | Greed Card (also called Alien Registration Card or Permanent Residence Card) |
| ICE | U.S. Immigration and Customs Enforcement |
| INA | Immigration and Nationality Act |
| INS | Immigration and Naturalization Services (transferred to USCIS, ICE, and CBP in 2003) |
| IO | Immigration Officer |
| IR | Initial Review |
| LC | Labor Certification |
| LCA | Labor Condition Application |
| LD | 领导 (spouse) |
| LIN | Lincoln, NE (= NSC) |
| LPR | Lawful Permanent Resident |
| LUD | Last Updated Date |
| MSC | Missouri Service Center |
| NAICS | North American Industry Classification System |
| NBC | National Benefits Center |
| NC | Name Check |
| ND | Notice Date |
| NIW | National Interest Waiver |
| NOID | Notice of Intent to Deny |
| NPWC | National Prevailing Wage Center |
| NSC | Nebraska Service Center (= LIN) |
| NVC | National Visa Center |
| OES | Occupational Employment Statistics |
| OMB | Office of Management and Budget |
| OPT | Optional Practical Training |
| OR | Outstanding Researcher |
| PD | Priority Date |
| PERM | Program Electronic Review Management System |
| PL | Petition Letter |
| POE | Port of Entry |
| PP | Premium Processing |
| PR | Permanent Residence |
| PRC | Permanent Residence Card (also called Alien Registration Card or Green Card) |
| PW/PWR | Prevailing Wage/Prevailing Wage Rate |
| PWD/PWRD | Prevailing Wage Determination/Prevailing Wage Rate Determination |
| RD | Receipt Date or Received Date |
| RFE | Request for Evidence (注意不是REF，也不是reference) |
| RL | Reference Letter |
| ROW | Rest of world |
| SEVIS | Student and Exchange Visitor Information System |
| SO | Spill Over |
| SOC | Standard Occupational Classification |
| SR | Service Request |
| SRC | Southern Regional Center (= TSC) |
| STEM | Science, Technology, Engineering, and Mathematics |
| SWA | State Workforce Agency |
| TSC | Texas Service Center (= SRC) |
| USCIS | U.S. Bureau of Citizenship and Immigration Services |
| VB | Visa Bulletin |
| VSC | Vermont Service Center (= EAC) |
| WAC | Western Adjudication Center (= CSC) |