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There are eight to nine different Halo rings depending on whether or not you consider the Ark to be one of the Halo Array. The rings are as follows:

  • Installation 01
  • Installation 02
  • Installation 03
  • Installation 04 (Alpha Halo, seen in Halo: CE)
  • Installation 05 (Delta Halo, seen in Halo: 2)
  • Installation 06
  • Installation 07
  • Installation 00 (The Ark, probably more of a Shield World)
  • Installation 04B (A replacement Installation 04 under construction during Halo 3)

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