+A **sentry** is a guardian, a silent observer at a post. It signifies a dedicated [Point of Vigilance](/wiki/point_of_vigilance) or an automated [Detection System](/wiki/detection_system), ever watchful against intrusion or change.
+## See also
+- [Guard](/wiki/guard)
+- [Watchtower](/wiki/watchtower)
+- [Alert System](/wiki/alert_system)
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