Initialism of schizoid personality disorder.
"The driver was pulled over because his spd exceeded the posted limit on the highway."
Abbreviation of speed.
In plain English: SPD is an acronym for the Schutzstaffel, which was a paramilitary group that served as Hitler's personal bodyguard and later became a powerful Nazi organization.
"The SPD is currently leading in the latest opinion polls for the national election."
Shimano Pedaling Dynamics
"The new shoes feature SPD soles designed to lock securely into clipless pedals for efficient power transfer."
The abbreviation spd comes directly from the German name of the Social Democratic Party of Germany. It was adopted into English to refer specifically to this political organization and its members.