These IEC power cords are the standard Jumper Cables (or Network Patch Cables) used for PDUs, servers, and UPSs. The male end connects to any IEC-60320-C21 outlet or connector, while the female end connects to any device or appliance that has an IEC-60320-C20 inlet. This could be considered an extension cord since it extends the range (length) for your equipment or devices from the power source.