what are the terrorist method of surveillance

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What is the abbrevitaion of surveillance

Surveillance is the monitoring of the behavior, activities, or other changing information, usually of the people for the purpose of influencing, managing, directing, or protecting. The various forms of counter surveillance are - computer surveillance, telephones, surveillance cameras, social network analysis, biometric surveillance, aerial surveillance, data mining and profiling, corporate surveillance, human operatives, satellite imagery and identification and credentials.

Motion sensors and surveillance cameras are used in basic security surveillance.