1. Based on the principle of having only one member (as of a legislature) selected from each electoral district
   - uninominal system, uninominal voting system, single-member system, scrutin uninominal voting system

Type of: electoral system, voting system

• special act
• special agent
• Special Air Service
• special assessment
• Special Branch
• special contract
• special court-martial
• special delivery
• special drawing rights
• special education
• special effect
• Special Forces
• special interest
• special jury
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• special relativity theory
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• Special Weapons and Tactics squad
• Special Weapons and Tactics team