| Acronym | Definition |
|---|
| NIGA➣National Indian Gaming Association |
| NIGA➣Neutron-Induced Gamma Activity |
| NIGA➣Nuclear Indirect Gamma Activity |
| NIGA➣Nevada Insurance Guaranty Association (Las Vegas, NV) |
| NIGA➣Northeastern Indiana Gaming Association (South Whitley, IN) |
| NIGA➣National Issuing and Guaranteeing Association (India) |