| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | leave no trace | United States | Important principle for outdoor activities to minimize impact on the environment and wildlife | 1 |
| 2 | leave no trace principle | United States | Highly emphasized in outdoor activities and national parks, leaving nature undisturbed | 1 |
| 3 | tracer | US | Commonly used in firearms to track the trajectory of bullets or projectiles. | 1 |