* Master Control Program: This is the most common meaning of MCP, particularly for those familiar with the movie "WarGames." It refers to the central computer system that controls a network of computers.
* Metacarpophalangeal joint: This is a joint in the hand that connects the metacarpal bone to the proximal phalanx. It's commonly called the "knuckle."
* Message Control Processor: In telecommunications, this is a component responsible for managing the flow of messages in a network.
* Media Control Protocol: This is a protocol used in network communication.
* Main Control Panel: This refers to the primary control panel in a system.
To understand the specific meaning of "MCP" in your context, please provide more information. For example, what is the context in which you saw or heard the term?