Typically, these marks will be specified on the purchase order. The marks will then be indicated on the documentation prepared, including the proforma invoice, bill of lading or bill of airway, and consular invoice. Many markings may be needed for shipment. Port of entry. Symbols are often used as a form of shorthand, especially in areas where literacy in foreign languages may not be high.
Legibility is extremely important to prevent misunderstandings and delays in shipping.
Letters and symbols are generally stenciled onto packages and containers in waterproof ink. Markings should appear on three faces of the container, preferably on the top and on the two ends or the two sides. Old markings must be completely removed. In addition to port marks, customer identification code, and indication of origin, the marks should include the package number, gross and net weights, and dimensions. If more than one package is being shipped, the total number of packages in the shipment should be included in the markings.