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.
I looked at the catalog and filled out the order form with the necessary details.
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.