emI

EMI is an acronym that can refer to several distinct concepts in different fields, most commonly electromagnetic interference, a historic music company, and the European Monetary Institute.

Electromagnetic interference (EMI) describes unwanted disturbance that affects an electrical circuit, equipment, or system due to electromagnetic energy from external or internal sources. EMI can be conducted through wires or radiated through space and can degrade signal quality, cause data errors, or malfunction devices. Mitigation requires design practices and standards for electromagnetic compatibility (EMC), such as shielding, filtering, proper grounding, layout considerations, and adherence to regulatory limits like CISPR, FCC, or MIL-STD guidelines.

EMI also denotes Electric and Musical Industries Ltd, a major British record label and music company founded in 1931 when the Gramophone Company and the Columbia Graphophone Company merged. It grew into a multinational group with recording and publishing operations. In 2012, EMI's recorded-music business was acquired by Universal Music Group, while its publishing arm was acquired by a Sony-led consortium. Following the sale, the EMI brand was gradually retired in most markets, with assets integrated into other labels under different corporations.

European Monetary Institute (EMI) was established in 1994 to prepare for Economic and Monetary Union and the introduction of a single European currency. Based in Frankfurt, it coordinated national central banks and worked on policy harmonization, legal frameworks, and technical groundwork. On 1 June 1998, EMI was replaced by the European Central Bank as part of the transition to the euro and a unified monetary policy framework for the Eurozone.