Bond

Anything that binds, fastens, or holds together pieces of material, as the connection of one stone to another. A certificate of ownership of a specified portion of a capital debt due by a government, a city, a railroad, or other corporation, to individual holders, and usually bearing a fixed rate of interest. Also an electrical connection, such as a bar of copper wire soldered to two track rails near their junction. Also the manner of laying bricks or  masonry stones. A guarantee.