The flow of air down a flue/chimney and into a house caused by low indoor air pressure that can occur when using several fans or fireplaces and/or if the house is very tight.

Material placed in a drilled hole to fill space around anodes, vent pipe, and buried components of a cathodic protection system.

The owners of a ship are entitled to payment as freight for merchandise returned through the fault of either the consignees or the consignors. Such payment, which is over and above the normal freight, is called backfreight.

Freight payable back to the port of loading or another convenient port when the vessel is unable to reach the port of destination.

To haul a shipment back over part of a route it has traveled.

A deviation to move cargo on the return leg of a voyage for the purpose of minimizing ballast mileage and thereby reducing transportation costs.

To push a sail out so that the wind fills the opposite side, thus slowing the boat down.

Alternatively letting the sails draw, then spilling wind so as to keep a vessel more or less in one place until space is available, marking time.

A counterclockwise change in wind direction. Backing winds with height are indicative of cold air advection (CAA).

The play or loose motion in an instrument due to the clearance existing between mechanically contacting parts.

Where a seller/shipper issues a 'letter of indemnity' in favour of the carrier in exchange for a clean bill of lading

Area of a computer or other device where various logic and control elements are interconnected. Often a printed circuit board into which other circuit boards plug at right angles.

A delta-neutral spread composed of more long options than short options on the same underlying.

A spring line from the stern of a boat to mid ships to stop forward movement

A navigation instrument used to measure the apparent height of a landmark whose actual height is known, such as the top of a lighthouse. From this information, the ship's distance from that landmark can be calculated.

Standing or running (adjustable) wire rigging that supports the mast from the stern; a wire mast support leading aft to the deck or another mast

Stays running from a masthead to the vessel's side, slanting a little aft. See STAYS.)

Uses a large historical price database to evaluate a trading system's.

A reserve appliance; for example, a standby generator for a home or commercial building.

In the futures market the price of a contract for future delivery of a commodity usually trades.