Definitions
Etymology
Pictograph of an arrow inside a quiver. Based on the original meaning "quiver, arrow case". The meaning later shifted to "case", "box", "envelop" and "letter".
About
The character 函 visually represents an object placed within an enclosing container. Its etymology features an outer frame symbolizing a box or pouch that surrounds inner components, which stand for stored or hidden items. Originally, it meant a protective case or envelope, or the act of containing something within a boundary. Since important messages were historically sealed in such cases for transport, its meaning extended to denote a formal letter or official correspondence. In mathematics, it refers to a function containing specific variables.
Example Sentences Hide
我收到一封信函。
他寄出了一封公函。
公司需要回复这封函。
我们通过函授学习课程。
图书馆里有许多历史函件。
请将申请函发送至办公室。
由于时间紧迫，我们必须尽快处理这些公函。
外交部就此事向大使馆发出了正式照会函。