| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | df 21 | Eastern countries | DF 21 is an important military standard for digital communication and data exchange in Eastern countries. | 3 |
| 2 | df 21 | Western countries | In Western countries, the concept of 'df 21' is not recognized and is commonly used in industrial applications. | 3 |