SPD is the Social Democratic Party of Germany, a political party. SPD may also refer to: Science and technology Suspended Particle Device, glass or plastic with electrically variable light transmission Shimano Pedaling Dynamics, clipless bicycle pedals Spectral power distribution, of light Surge protection device, for electrical voltages Severe plastic deformation Symmetric positive definite, in linear algebra Short-path distillation Spin Physics Detector, a component of the planned NICA particle accelerator near Moscow, Russia Computing Security Policy Database, rules in an IPsec implementation, for example in a High Assurance Internet Protocol Encryptor Serial presence detect, a method to access memory module information SharePoint Designer, an interface for designing in Microsoft SharePoint Short Payment Descriptor, a compact textual data format (a MIME/file type) for an easy exchange of a payment information, using smart phones or NFC devices; a standard for QR code payments SPD (Systems Product Division) bus, an I/O bus used in the IBM 9370 and IBM AS/400 systems. Medicine Schizoid personality disorder, a personality disorder Sadistic personality disorder, a personality disorder Split personality disorder, an alternative name for dissociative identity disorder, a mental disorder. Semantic pragmatic disorder, a pervasive developmental disorder Symphysis pubis dysfunction, pelvic joint pain during pregnancy or childbirth Sensory processing disorder, a neurological disorder Sterile processing department, where surgical instruments are sterilized Salmon poisoning disease Organisations Freedom and Direct Democracy, a Czech political party Social Democratic Party of Germany, a German political party Serbian Movement Dveri (Srpski pokret Dveri), a political party in Serbia Nintendo Software Planning & Development Salym Petroleum Development, a petroleum company in Russia Scuola Politecnica di Design, a Milan-based postgraduate design school Small Press Distribution, distributor for literary publishers, Berkeley, California, US Shanghai Pudong Development Bank, or SPD Bank, China Police Sacramento Police Department Sanford Police Department Sarasota Police Department Seattle Police Department Springfield Police Department (disambiguation) Fiction Space Patrol Delta, an organization in Power Rangers: S.P.D. Special Police Dekaranger, a police organization in Tokusou Sentai Dekaranger Other uses Saidpur Airport (IATA code), Bangladesh Supplementary planning document, in UK local development framework See also Schizotypal personality disorder (STPD) SDP (disambiguation)