The meaning of the Acronym SD is...

SD is

• Small Dual in-line package
• Structured Design
• Supplier Documentation
• Subscale Demonstrator
• Specification Document
• Spare Disposition
• Space Division (Rockwell)
• Space Division (AFSC)
• Solar Dynamic
• Smoke Detector
• Scaling and Display

More Meanings For SD:

• Doctor of Spirituality
• Sketch Dimension
• Smoke Detector
• Sun Deck
• Specification & Description
• Structured Design
• A Specific Duty
• Schwinger-Dyson (equation)
• Super Deformed
• Systematic Desensitisation
• Structured Design
• Standard Deviation
• Strength Divisor
• Scale Dependent
• Sentential Derivation

SD is also in:

• Academic Degrees
• Architecture
• Chemistry
• Electronics
• Mathematics
• Meteorology
• Physics
• Psychology