O.R. - Owner's Risk.

O.T. Labor - Work performed on overtime.

Ocean Bill of Lading - A contract between a exporter and an international carrier for transport of merchandise to a specified foreign market. Compare Inland Bill of Lading, Through Bill of Lading.

Official Contractor - Show management appointed company providing services to a trade show and/or its exhibitors. Also called General Contractor. Compare with Exhibitor Appointed Contractor.

On-site - A reference to the exhibit location. Also called At-site.

On-site Order - Floor order placed at a show site.

Overtime - A designation for work performed outside the hours specified as normal working hours. Usually work performed on overtime is charged at a substantially higher rate.