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MMU, short for Memory Management Unit, is a hardware component responsible for handling memory access requested by the CPU. Among the functions of this device are the translation of virtual addresses to physical addresses, memory protection, cache control and bus arbitration.

MMU is also an acronym meaning Manned Maneuvering Unit.

This is a jetpack (propulsion backpack that snaps onto the back of the spacesuit) which has been used on spacewalks (EVAs) from NASA's space shuttle, allowing an astronaut to move independently from the shuttle.

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Universal postal union

... hence the world-wide postal system. Each member country agrees to the same set of terms for conducting international postal duties. Prior to the UPU, a country would ...