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An electromechanical device that completes or interrupts an electrical circuit by physically moving conductive contacts. The resultant motion can be coupled to another mechanism such as a valve or breaker.
Source(s):
NIST SP 800-82 Rev. 2
from
The Automation, Systems, and Instrumentation Dictionary
A scheme deployed on a given blockchain to receive and verify transactions from another blockchain.
Source(s):
NISTIR 8301