Heat is energy in transfer to or from a thermodynamic system by mechanisms other than thermodynamic work or transfer of matter. Heat or HEAT may also refer to: Science and technology Heat wave, a period of excessively hot weather HEAT repeat, a solenoid protein domain found in a number of cytoplasmic proteins Heat, in metallurgy, one batch of molten metal processed in a converter or open hearth furnace High Elevation Auger Telescope, at the Pierre Auger Observatory, Argentina Medicine Fever, a body temperature above the normal range in response to internal physiological conditions Heat illness, a spectrum of disorders due to environmental exposure to heat: Heat cramps, muscle spasms that result from loss of large amount of salt and water through exercise Heat edema, swelling of the hands and/or feet due to over-expansion of the blood vessels in the extremities in response to heat Heat exhaustion, caused by the loss of water and electrolytes through sweating Heat rash, skin irritations caused by excessive sweating or blocked sweat glands Heat stroke, with a body temperature greater than Heat syncope, fainting or dizziness as a result of overheating Heat tetany, cramps and seizures caused by calcium and/or magnesium loss due to excessive sweating in short periods of stress in high heat Hyperthermia, elevated body temperature due to failed thermoregulation that occurs when a body produces or absorbs more heat than it dissipates Malignant hyperthermia, a type of severe reaction that may occur to susceptible patients during general anesthesia Hot flash or hot flush, a feeling of heat, with sweating and increased heart rate, usually experienced by menopausal women due to low estradiol Computing HEAT (software), help desk software by FrontRange Solutions OpenStack Heat, the orchestration component of the OpenStack infrastructure-as-a-service software platform Arts, entertainment and media Games Need for Speed: Heat Films Heat (1963 film), a Soviet drama film directed by Larisa Shepitko Heat (1972 film), an American drama film directed by Paul Morrissey, starring Sylvia Miles and Joe Dallesandro Heat (1986 film), an American action-thriller film directed by Dick Richards and Jerry Jameson, starring Burt Reynolds Heat (1995 film), an American crime drama directed by Michael Mann, starring Al Pacino, Robert De Niro and Val Kilmer Natural Justice: Heat (1996), an Australian television film, sometimes referred to as Heat, directed by Scott Hartford-Davis Heat (2006 film), a Russian comedy film directed Rezo Gigineishvili The Heat (film), a 2013 comedy film directed