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| SIU | Special Investigations Unit | |
| SIU | Special Investigations Unit | |
| SIU | Scheduling Information Unsolicited | |
| SIU | Stimulus Isolation Unit | |
| SIU | Southern Illinois University | |
| SIU | Seafarers International Union | |
| SIU | Shelf Interface Unit | |
| SIU | Seiko Instruments USA, Inc. | |
| SIU | Special Infiltration Unit | |
| SIU | Significant Industrial User | |
| SIU | Special Investigative Units | |
| SIU | Special Investigative Unit | |
| SIU | Special Investigations Unit | |
| SIU | Signal Interface Unit | |
| SIU | Sirius Telecommunications Ltd | |
| SIU | Slave In Utero | |
| SIU | Skin Installer Ultimate | |
| SIU | Special Investigation Unit | |
| SIU | Specialized Intervention Unit | |
| SIU | International Society of Urology | |
| SIU | Société Internationale d'Urologie | |
| SIU | System Identification Utility | |
| SIU | Shake It Up | |
| SIU | Serious Incident Unit | |
| SIU | Saab Information Unit |
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