noun, noun or participle which takes 'suru'
one's own handwriting; writing by oneself
Refers to something written in one's own hand, as opposed to typed or dictated. Often used in formal or legal contexts to emphasize authenticity.
この手紙は彼の手書です。
This letter is in his own handwriting.
契約書は必ず手書で作
Please be sure to prepare the contract in your own handwriting.