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  Recognized action, specific, generalized, or theoretical, that an adversary might be expected to take in preparation for an attack.
CNSSI 4009-2015

  A technical artifact or observable that suggests an attack is imminent or is currently underway, or that a compromise may have already occurred.
NIST SP 800-150 under Indicator

  A sign that an incident may have occurred or may be currently occurring.
NIST SP 800-61 Rev. 2 under Indicator