O/A — Open Account.

O/N — Order Notify.

OR — Owner’s Risk.

OS&D — Over, Short and Damage.

OT —On Truck or Railway.

Ocean Bill of Lading — A bill of lading (B/L) indicating that the exporter consigns a shipment to an international carrier for transportation to a specified foreign market. Unlike an inland B/L, the ocean B/L also serves as a collection document. If it is a "Straight B/L," the foreign buyer can obtain the shipment from the carrier by simply showing proof of identity. If a "Negotiable B/L" is used, the buyer must first pay for the goods, post a bond, or meet other conditions agreeable to the seller. Compare AIR WAYBILL, INLAND BILL OF LADING, THROUGH BILL OF LADING.

Official Contractors — Service organizations appointed by exhibition management. Also GENERAL CONTRACTORS.

On-Center — Refers to measurement of space from center of a solid object (such as a COLUMN) to another point.

On-Site — Location of exhibits or project. Also called AT-SITE.

On-Site Order — Floor order placed at show site.

One Shot — 1. Type of paint used for painting banners. 2. Exhibit or display fabricated for one use only.

One Ten/Sixty — Common term describing normally available current in North American Continent. The full expression is 110 volt/60 cycle. Many European and South American areas have 220 volt/50-cycle power only.

Open Insurance Policy — A marine insurance policy that applies to all shipments made by an exporter over a period of time rather than to one shipment only.

Open Shop — 1. Generally refers to states that are right to work states. 2. Company in which union membership is not a condition of employment.

OT Labor — Work performed on overtime billed at either time-and-one-half or twice the published labor rates.

Outsource — To subcontract a task or responsibility to a supplier.

OTR - Over the Road. Freight that moves on the road, typically shipped directly to the convention center.

Overlay — A panel mounted to another surface.

Overtime —1. Time worked by an employee outside of, or in addition to, regular working time or beyond the legal maximum hours of work. 2. Rate charged at one and one-half times or two times the straight time rate for work performed outside of the normal work hours.