遗书

遺書
wèishū
  1. (Classical) to send a letter; to write to someone
  2. to send a letter; to write to someone

Wiktionary

Homographs

遗书 yíshū
  1. posthumous writing
  2. testament
  3. suicide note
  4. ancient literature

Entry Composition

1 遗 yí (bound form) to leave behind
=2 书 Shū abbr. for 书经 Shūjīng
=2 书 shū
  1. book
  2. letter
  3. document
  4. to write

classifiers: 本, 冊, 部