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| SIYB | Stichting International Youth Bridges | |
| SIYB | Spokane Indians Youth Baseball | |
| SIYB | Spokane Indians Youth Baseball | |
| SIYB | STEM In Your Backyard | |
| SIYE | Sink Into Your Eyes | |
| SIYE | Science in Your Eyes | |
| SIYFF | Seoul International Youth Film Festival | |
| SIYFF | Seoul International Youth Film Festival | |
| SIYFF | Seoul International Youth Film Festival | |
| SIYI | Something In Your Inbox | |
| SIYL | Stay In Your Lane | |
| SIYSS | Stockholm International Youth Science Seminar | |
| SIYSS | Stockholm International Youth Science Seminar | |
| SIYSS | Stockholm International Youth Science Seminar | |
| SIZ | Sizeler Property Investments, Inc. | |
| SIZ | Sissano, Papua New Guinea | |
| SIZ | Size | |
| SIZ | Sizzle | |
| SIZ | Support and Information Zone | |
| SIZ | Systemic Innovation Zone | |
| SIZ | Shore Impact Zones | |
| SIZ | Security Identification Zone | |
| SIZ | Special Industrial Zone | |
| SIZ | Schweizerisches Informatik Zertifikat | |
| SIZ | Support Information Zone |
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