Halo Array

Trivia

The Halos are remarkably similar to the eponymous megastructure of Larry Niven's Ringworld series. However, Niven's Ringworld encircles a large star, whereas the Halos merely orbit planets, being much smaller than the former. The Halos are also very similar to the Orbitals from Iain M. Banks' Culture series, though considerably smaller.
In a Halo: Combat Evolved prototype, Installation 04 had a section that was only partially constructed. This feature was dropped from the final game, though it inspired the design of the second Installation 04.
The Prophet of Mercy once referred to the Halo Array's pulse as a divine wind.^[1] This is a literal translation of kamikaze, suicide attacks carried out by Japanese pilots against Allied vessels near the end of World War II. Kamikaze aviators were willing to give their lives based on their fanatical devotion to defend Emperor Hirohito and the state. This is mirrored by the Covenant's quest to activate the Halos and commit holy war in deference to their gods.

Installation 04 in Halo: Combat Evolved.
Installation 05 in Halo 2.
The surface of a Halo ring.
Installation 08 in Halo 3.
Installation 00 sending the Halo Array through a slipspace portal during the Forerunner-Flood war in Halo Legends: Origins.
A Halo installation.
A Halo being fired.
A Halo ring's pulse dimming after its activation.
Broken Installation 04 in The Mona Lisa.
Installation 04 in Halo: Combat Evolved Anniversary.
A visual reference to a Halo ring in Halo 4: Forward Unto Dawn.
Installation 03 in Halo 4.
Installation 03 ejecting a section of itself in Halo: Escalation.
Alpha Shard in Halo: Nightfall.
Installation 05 in Halo 2: Anniversary.
A post-war human station near an unknown Halo installation in A Hero Falls.
Installation 03 in Halo: Spartan Strike.
A Halo in Halo 5: Guardians.
Alpha Shard in Halo Mythos.
Captain James Cutter stands before Installation 04's second replacement in Halo Wars 2.