| SIPO | Serial In Parallel Out 
| Others |
| SIPO | Serial In, Parallel Out
| Others |
| SIPO | Serial Input Parallel Output
| Others |
| SiPo | SicherheitsPolizei (Security Police)
| Others |
| SIPO | Slovenian Intellectual Property Office
| Others |
| SIPO | South India Plantation Operations
| Others |
| SIPO | South Island Pied Oystercatcher
| Others |
| SIPO | Spreading Ideas Providing Opportunities
| Others |
| SIPO | Spreading Ideas Providing Opportunity
| Others |
| SIPO | Standards in Public Office
| Others |
| SIPO | State Intellectual Property Office
| Others |
| SIPO | Statement of Investment Policies and Objectives
| Others |
| SIPO | Statement of Investment Policy and Objectives
| Others |
| SIPO | Statements of Investment Policy and Objectives
| Others |
| SIPO | Strategic Indicative Plan for the Organ
| Others |