The meaning of the Acronym SPD is...

SPD is

• Shimano Pedaling Dynamics
• Strange Pedal Detachment
• Shimano Pedaling Dynamic

More Meanings For SPD:

• Southern Polar Distance
• Suspended Particle Device
• Silicon Photo Diode
• Symmetric Positive Definite
• Symmetric Positive Definite Matrices
• Symmetric Positive Definite matrix
• Shizoid Personality Disorder
• State Price Density
• Systems Products Division
• Shimano Pedal Dynamics
• System Products Division
• Schedule Price And Dispatch
• Standard Procedural Database
• Special Police Dekaranger
• Small Press Distribution

SPD is also in:

• Accounting
• Astronomy
• Chemistry
• Electronics
• Firms
• General
• Law
• Mathematics
• Media
• Psychology