Novi Sad

City (pop., 2002: 191,405), Serbia. The administrative capital of the autonomous region of the Vojvodina, it is a transit port on the Danube River northwest of Belgrade. Founded in the 17th century, it was part of Hungary until the formation of Yugoslavia in 1918. The city is an ethnically diverse agricultural centre; its economy suffered badly during the 1990s Balkan upheavals.

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The acronym SAD may refer to:

• Sagittal Abdominal Diameter, the diameter around one's waistline
• Schizoaffective disorder, a psychiatric diagnosis with symptoms of a mood disorder and schizophrenia
• Seasonal affective disorder, a mood disorder with depressive symptoms in the winter
• Separation anxiety disorder, a psychological condition related to anxiety of separation from home or from people
• Sexual arousal disorder, the inability to attain or maintain typical responses to sexual arousal
• Selected area diffraction, a crystallographic experimental technique that can be performed inside a transmission electron microscope
• Shiromani Akali Dal, an Indian political party
• Silicon Avalanche Diode, an electronic component
• Singles Awareness Day, a humorous holiday celebrated on February 14
• Small angle diffraction, a technique for analysing materials
• Social anxiety disorder, a diagnosis referring to excessive anxiety in social situations
• Software architecture document, a document for the architecture of computer software
• Special Activities Division, the Central Intelligence Agency's special operations force in the United States
• Standard American Diet, a phrase associated with diet-related obesity in the United States
• Sum of absolute differences, a simple metric for motion estimation in video compression
• Systems Analysis and Design, an interdisciplinary part of science

Sad can also mean:

• Ṣād, a letter of the Arabic alphabet (ﺹ).
• Sad (sura), the 38th sura of the Qur'an (named after the letter)
• Sad, Podlaskie Voivodeship (north-east Poland)
• Sad, Dnipropetrovsk Oblast, an urban-type settlement in Dnipropetrovsk Oblast, Ukraine