Sentry (disambiguation)

Sentry or turret can refer to:

• the Sentry Gun - a fully autonomous tripodal weapon featured in Half-Life and its expansions, commonly used by the HECU and the Black Ops
• the Automatic Turret - a ceiling-mounted sentry weapon used by Black Mesa in its facility for security
• Aperture Science creations:
  • the Aperture Science Sentry Turret, used as a testing element
    • the Defective Turret - damaged, unfinished, or faultily assembled Sentry Turrets
    • the Frankenturret - a hybrid of a Weighted Storage Cube and two Sentry Turrets, created by Wheatley
    • the Oracle Turret - a malfunctioning but a more self-aware Sentry Turret, known for its enigmatic sentences
    • the Animal King - an enormous Sentry Turret introduced in Portal 2
    • the Turret Opera - an opera made of Sentry Turrets, seen at the end of Portal 2
    • the Walking Turret - a mobile Sentry Turret cut from Portal
  • the Rocket Turret - a static rocket-firing gun platform eventually used by Chell to defeat GLaDOS at the end of Portal
• Combine creations:
  • the Combine Sentry Gun - a fully autonomous tripodal pulse weapon featured in Half-Life 2 and its Episodes, Half-Life 2: Survivor, and Half-Life: Alyx
  • the Combine Ground Turret - a ground-concealed pulse sentry weapon used within the Overwatch Nexus
  • the Combine Ceiling Turret - a turret built into the ceiling
  • the Autogun - a powerful pulse turret seen in Half-Life 2: Episode Two
• Xen weapons:
  • the Energy Cannon - an autonomous cannon encountered only once in Half-Life
  • the Violet Crystal - an automatic ceiling-mounted biological weapon found only in Xen

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