| SIG | Signal | |
| SIG | Special Interest Group | |
| SIG | Special Interest Group | |
| SIG | Support and Information Group | |
| SIG | Signature File | |
| SIG | Settings File | |
| SIG | Secure Internet Gateway | |
| SIG | Sistem Informatic de Gestiune | |
| SIG | Safer Internet Group | |
| SIG | Said In Gest! | |
| SIG | Sustainable Investment Group | |
| SIG | Search Investment Group | |
| SIG | Social Intervention Group | |
| SIG | Self Improvement Game | |
| SIG | Schools Insurance Group | |
| SIG | Schools Insurance Group | |
| SIG 750 SAPR | Schweizerische Industrie Gesellschaft 750 Semi Auto Precision Rifle (Swiss Industrial Society) | |
| SIG 750 SAPR | Schweizerische Industrie Gesellschaft 750 Semi Auto Precision Rifle (Swiss Industrial Society) | |
| SIG CONDR | SIGnal CONDitioneR | |
| SIG form | Standardized Information Gathering form | |
| SIG GEN | SIGnal GENerator | |
| SIG SG | Schweizerische Industrie Gesellschaft Sturmgewehr (Swiss Industrial Society Assault Rifle) | |
| SIG SG | Schweizerische Industrie Gesellschaft Sturmgewehr (Swiss Industrial Society Assault Rifle) | |
| SIG SG 510 | Schweizerische Industrie Gesellschaft Sturmgewehr 510 (Swiss Industrial Society Assault Rifle 510) | |
| SIG SG 510 | Schweizerische Industrie Gesellschaft Sturmgewehr 510 (Swiss Industrial Society Assault Rifle 510) |
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