信函

Traditional form:

信函

Pinyin (reading):

xìnhán

Definitions:

• letter
• piece of correspondence (incl. email)

Characters:

• 信 - to trust, to believe; letter, sign
• 函 - correspondence; a case, a box

Traditional characters:

• 信 - to trust, to believe; letter, sign
• 函 - correspondence; a case, a box