| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | letter slot | United States | Letter slots are commonly found on residential doors for mail delivery. | 1 |
| 2 | letter slot | United States | Commonly found in residential doors for mail delivery | 1 |
| 3 | letter slot | United States | Found on the front door of houses for receiving mail | 1 |
| 4 | letter slot | United States | Letter slots are commonly found on residential front doors, allowing mail to be delivered directly into the home. | 1 |