One Child Policy - Chinese system designed to reduce the country's massive population growth
Open-circuit potential - in electrochemistry, an electric potential measured at zero net current
Operador de Cabine Polivalente - the name of a sound project by Portuguese electronic musician João Ricardo ( http://ocp.pt.vu )
Optically Channelled Potentiator - a fictional device in the video game Splinter Cell: Chaos Theory. It is a disruptor mounted on Sam Fisher's 5.72mm pistol and can temporarily disable any electronic system.
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