| SIGMA | Sign and Mac 
| Others |
| SIGMA | Societe Industrielle Genevoise de Mecanique et d'Automobiles
| Others |
| SIGMA | Society Of Independent Gasoline Marketers Of America
| Others |
| SIGMA | Software Industrialized Generation and Maintenance Aids
| Others |
| SIGMA | Sustainability Integrated Guidelines for Management and Associates
| Others |
| SIGMA | Suzuku Initoma Goka Misao Anuu
| Others |
| SIGMA | Symmetry Integrability and Geometry Methods and
| Others |
| SIGMA | System For Integrated Generalised Modelling Analysis
| Others |
| SIGMA | System Integrated Genuinely Manipulated Assembly
| Others |