HAARP (High-Frequency Active Auroral Research Program) is a high-powered radio transmission research facility in Alaska jointly operated by the US Navy, Air Force and several universities; a BIG particle gun.
RCON is a text based protocol completely unrelated to the Source RCON protocol. It is designed with readability, ease of implementation, and human usability in mind.
An RCD (residual current device) is an electrical safety device that cuts off electricity when it detects electrical faults to earth.: How fast should a safety switch turn off the power? Typically around 10 to 30 milliseconds (ms) although some older RCDs may be much slower which is why it is always a good idea to test your RCD every 1 or 2 months.