A Bill of Lading (BL or BOL) is a legal document issued by a carrier to a shipper that details the type, quantity, and destination of the goods being carried. A bill of lading also serves as a shipment receipt when the carrier delivers the goods at a predetermined destination. This document must accompany the shipped products, no matter the form of transportation, and must be signed by an authorized representative from the carrier, shipper and receiver.
Source: https://www.investopedia.com/terms/b/billoflading.asp