4Pi
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4Pi may refer to: * IBM System/4 Pi, a family of avionics computers * 4Pi microscope, a microscope that uses interference and fluorescence computers * 4×π = 12.56637..., the solid angle of a complete sphere measured in steradians * Hermetic detector (also called a 4π detector)
4Pi may refer to: IBM System/4 Pi, a family of avionics computers 4Pi microscope, a microscope that uses interference and fluorescence computers 4×π = 12.56637..., the solid angle of a complete sphere measured in steradians Hermetic detector (also called a 4π detector)
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