1 Old HSK word(s): ☊函授 ** D
发函* * 公函* * 函* * 来函* * 去函* * 唁函* * 致函* *

Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.

致 send, deliver, present / cause
函 correspondence / a case / a box

Hsk Characters: 函 *
HSK -Characters and beyond:
GbBig5EngRadMegaTripleMultilingual
函 51FD + 函 + + correspondence / a case / a box 凵 函 Pit 函 (BRIEF) han2 +

Korean:

函 + 函 함함
0 NHSK word(s):
KOREAN6000 word(s):
0 KOREAN 2500 New HSK words):
1 KOREAN Sentence(s):
是啊, 我们也收到邀请函了。 + 네, 우리도 초대 받았어요. ne, urido chodae badasseoyo.