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==Science, technology and mathematics== ===Computing and communications=== * [[Hollerith Electronic Computer]], Britain's first mass-produced business computer * [[Header Error Control]], a method used in some telecommunication protocols * [[HDMI Ethernet Channel]], an audiovisual technology ===Medicine=== * [[HEC syndrome]], a condition * [[Human equivalent concentration]] * [[Hyperinsulinemic euglycemic clamp]], a test of insulin resistance ===Other uses in science and mathematics=== * [[Habitable Exoplanets Catalog]], in astronomy * [[Hyperelliptic curve]], in algebraic geometry * [[Hydroxyethyl cellulose]], a thickening agent * HEC-meeting, the [[Heart of Europe Bio-Crystallography Meeting]]
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