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.
A residual-current device (RCD), or residual-current circuit breaker (RCCB), is a device that instantly breaks an electric circuit to prevent serious harm from an ongoing electric shock. Injury may still occur in some cases, for example if a human falls after receiving a shock.