The Triple Ejector Rack (TER) allows aircraft to carry three weapons on a single pylon, thus increasing the weapons load that an aircraft can carry instead of a single weapon per pylon as was common in World War II and Korea. The TER attaches directly to the weapons pylon and allows the carriage of up to three of the same weapon, primarily bombs, on that weapons station.
The United States has used TERS since the Vietnam War and they still a common sight on US aircraft along with many NATO air forces. The bombs are attached to the TER by mounting lugs and are stabilized by adjustable sway braces on the TER.