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sensor

Definitions:

  An intrusion detection and prevention system component that monitors and analyzes network activity and may also perform prevention actions.
Sources:
NIST SP 800-150 from NIST SP 800-94

  A device that produces a voltage or current output that is representative of some physical property being measured (e.g., speed, temperature, flow).
Sources:
NIST SP 800-82r3 from The Automation, Systems, and Instrumentation Dictionary

  A portion of an IoT device capable of providing an observation of an aspect of the physical world in the form of measurement data.
Sources:
NISTIR 8259 from NISTIR 8228