written order; order form
Refers to a document used to place an order, such as a purchase order or a form filled out to request goods or services.
カタログを見て、注文書に必要事項を記入した。
I looked at the catalog and filled out the order form with the necessary details.
この商品は注文書でのみ受け付けています。
We only accept orders for this product via a written order form.
Compound of 注文 (order) + 書 (document). The exact historical derivation is straightforward; the word is a modern compound for a written order form.