SDP

1. UKabbreviationhistoricalinitialismgovernmentInitialism of Social Democratic Party, a centre-left political party in the United Kingdom.

   We believed that the Trots represented a mad, extreme form of Labour that was never going to do anything for anybody, yet we felt strongly that nothing would be achieved by jumping ship and defecting to the SDP.

   2008, Cherie Blair, Speaking for Myself: My Life from Liverpool to Downing Street

2. abbreviationinitialismcomputingInitialism of Session Description Protocol.
3. abbreviationinitialismSingaporean politicsInitialism of Singapore Democratic Party
4. abbreviationinitialismFinnish politicsInitialism of Social Democratic Party of Finland (“Suomen sosialidemokraattinen puolue”).

   SDP Chairman Antti Rinne, as leader of the largest party, will have first shot at forming a government, and at becoming the first left-wing prime minister in Finland since 2003.

   2019 April 15, Leona Siaw, “Center-left party wins Finland parliamentary election”, in CNN

plural SDPs

1. abbreviationcountableinitialismuncountableInitialism of symmetrized dot pattern.
2. abbreviationinitialismuncountablecomputingInitialism of stochastic dynamic programming.
3. abbreviationcountableinitialismuncountablecomputingInitialism of service discovery protocol.
4. abbreviationcountableinitialismuncountablecommunicationsInitialism of service data point.
5. USabbreviationcountableinitialismuncountablelawInitialism of sexually dangerous person.