Quarantine: A restraint placed on an operation to protect the public against a health hazard. A ship may be quarantined so that it cannot leave a protected point. During the quarantine period, the Q flag is hoisted.

Quotation: An offer to sell goods at a stated price and under stated terms.

”Ro/Ro” : A shortening of the term, ”Roll On/Roll Off.” A method of ocean cargo service using a vessel with ramps which allows wheeled vehicles to be loaded and discharged without cranes.