SPD

SPD is an acronym used in multiple fields to denote different concepts. This article outlines four common meanings: Sensory Processing Disorder, the Social Democratic Party of Germany, Surge Protective Device, and Serial Presence Detect in computing.

Sensory Processing Disorder describes difficulties in how the nervous system processes sensory information, which can affect attention, behavior, and daily activities. People may be overly sensitive or under-responsive to stimuli such as sound or touch. SPD is discussed mainly in occupational therapy and education contexts; it is not an official standalone diagnosis in DSM-5, and it is often described as a feature of other conditions such as autism. Treatment commonly includes occupational therapy, environmental adaptations, and strategies for home and school.

The Social Democratic Party of Germany (Sozialdemokratische Partei Deutschlands, SPD) is a center-left political party with a long history in Germany. It has played a major role in German politics, advocating social democracy, workers’ rights, and welfare policy. Across different eras it has led or participated in government and has promoted European integration and social justice. The party emphasizes a mixed economy, labor rights, and inclusive social policies.

A surge protective device protects electrical installations from transient overvoltages caused by lightning or switching events. They can be installed at service entry, distribution panels, or at the point of use, and are categorized as Type 1, Type 2, or Type 3 for different protection levels. Standards such as IEC 61643 and IEC 60364 guide their selection and installation.

In computing, Serial Presence Detect is an EEPROM on memory modules that stores timing, size, voltage, and other characteristics. The SPD data allows the system BIOS or firmware to configure memory settings automatically, aiding compatibility and performance.