Racks carry, arm, and release stores. Racks are either part of, or can be inserted into, the modular bay of a support structure such as a pylon. A rack can mount a store or another piece of suspension equipment, for example, numerous bombs being mounted onto a single pylon, such as was done on F-105 Thunderchief missions over Vietnam, or the large external pylons on the B-52 Stratofortress, which can carry 12 unguided bombs in four triple ejector racks mounted to a single pylon. Alternatively, using the same pylon, but different racks and adapters, 9 air-launched cruise missiles can be carried. Using modular racks and universal adapters makes it much easier to configure the desired load. Hardpoint - Wikipedia
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