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==Science, technology, and mathematics== * [[Ri (prefix symbol)]], a binary unit prefix symbol * [[Referential integrity]], a database concept * [[Refractive index]] of an optical medium (in physics/optics) is a number that describes how light propagates through that medium * [[Arterial resistivity index]], a measure of pulsatile blood flow * [[Ring Indicator]], a signal in the RS232 serial communications standard * [[Rhombicosahedron]], a polyhedron, by Bowers acronym * [[Residual income]], a financial profitability measure of a company * [[Reputation Institute]], a research and insights company that analyzes the reputation of corporations and places * [[Rapid intensification]], a phenomenon in which the wind speed of a tropical cyclone increases dramatically in a short period of time * [[Research infrastructure]], national or international infrastructure open to scientists (e.g. CERN) * [[Research institute]], an establishment founded for doing research
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