| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | hard hats | United Kingdom | Worn as a safety requirement in construction sites and industrial settings | 1 |
| 2 | hardhat | United Kingdom | Hardhats are standard safety gear at construction sites and other industrial workplaces. | 1 |
| 3 | hardhat | United Kingdom | Required safety equipment on construction sites for workers and visitors | 1 |
| 4 | hardhats | United Kingdom | Required safety gear for workers on road and infrastructure construction sites | 1 |
| 5 | hardtack | United Kingdom | Associated with military rations during wars, especially in the Civil War era | 1 |