| 函数 | hán shù | function (math.) | |
| 致函 | zhì hán | to send a letter | |
| 信函 | xìn hán | letter; piece of correspondence (incl. email) | |
| 函授 | hán shòu | to teach by correspondence | |
| 来函 | lái hán | incoming letter; letter from afar; same as 来信 |
| 1 | This set of Complete Tang Poems is in twelve cases. | |
| 2 | Thanks very much for receiving your consultion letter. | |
| 3 | Q:On the pastoral letter from the Pope. | |
| 4 | I think I might go out and buy a book on cover letters as well. | |
| 5 | Tehran delivered the letter to the International Atomic Energy Agency (IAEA) Monday. |