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1 The International Society for the Study of Individual Differences (ISSID) was founded in 1983 to foster research on individual differences in temperament, intelligence, attitudes, and abilities.
Part of the Electronics glossary: A toroid is a coil of insulated or enameled wire wound on a donut-shaped form made of powdered iron. A toroid is used as an inductor in electronic circuits, especially at low frequencies where comparatively large inductances are necessary. A toroid has more inductance , for a given number of turns, than a solenoid with a core of the same material and similar size. This makes it possible to construct high-inductance coils of reasonable physical size and mass.