
| hán | envelope/case/letter | 
| 函 | envelope case letter | 
| 函人 | armor maker | 
| 函件 | letters correspondence | 
| 函告 | inform | 
| 函售 | selling by mail | 
| 函复 | reply | 
| 函大 | correspondence university | 
| 函子 | [Mathematics] functor | 
| 函寄 | send | 
| 函式库 | library (partition on computer hard disk) | 
| 函授 | to teach by correspondence | 
| 函授大学 | correspondence university; correspondence college; OU; Open University | 
| 函授学校 | correspondence school | 
| 函授教学 | correspondence | 
| 函授课程 | correspondence course | 
| 函数 | function | 
| 函数解析 | [Mathematics] functional analysis | 
| 函洽 | To discuss through letters. | 
| 函电 | letters and cables; letters and telegrams | 
| 函索 | request |