noun
note left behind; letter left behind; will
A written message intentionally left for someone to find, often when departing or in case of death. Can refer to a suicide note, a farewell letter, or a last will.
彼は家族に書き置きを残して家を出た。
He left a note for his family and left the house.
机の上に書き置きがあった。
There was a note left on the desk.
Compound of 書き (kaki, 'writing', continuative form of 書く) + 置き (oki, 'placing', continuative form of 置く), literally 'write and leave'.