Abbreviations and Acronyms are defined in the Baseline Requirements except as otherwise defined herein:
| BIPM | International Bureau of Weights and Measures | 
| BIS | (US Government) Bureau of Industry and Security | 
| CEO | Chief Executive Officer | 
| CFO | Chief Financial Officer | 
| CIO | Chief Information Officer | 
| CISO | Chief Information Security Officer | 
| COO | Chief Operating Officer | 
| CPA | Chartered Professional Accountant | 
| CSO | Chief Security Officer | 
| EV | Extended Validation | 
| gTLD | Generic Top-Level Domain | 
| IFAC | International Federation of Accountants | 
| IRS | Internal Revenue Service | 
| ISP | Internet Service Provider | 
| QGIS | Qualified Government Information Source | 
| QTIS | Qualified Government Tax Information Source | 
| QIIS | Qualified Independent Information Source | 
| SEC | (US Government) Securities and Exchange Commission | 
| UTC(k) | National realization of Coordinated Universal Time |