Halo Franchise

Many products and ideas set in Halo Universe are titled or contain the word "Halo", named primarily after the massive ring-shaped space installations:

Video Games

 * The Halo Trilogy- The First Person Shooter trilogy.
 * Halo: Combat Evolved- The video game.
 * Halo PC- The Windows and Mac version of Halo: Combat Evolved.
 * Halo: Custom Edition- A free, unsupported upgrade to the windows part of Halo: Combat Evolved.
 * Halo 2- The video game
 * Halo 2 Vista- The Windows Vista version of Halo 2.
 * Halo 3- The final installment of the FPS series.
 * A series of Halo spin-off games.
 * Halo Wars- The RTS version of the Halo series in development by Ensemble Studios.
 * Halo: Chronicles- A Halo game developed by Peter Jackson and Wingnut Interactive is association with Bungie. It is also revealed that it will be episodic and is as of at least November 23rd, in the development stage.

Video Game Levels

 * "Halo"- The second level in Halo: Combat Evolved.
 * "Delta Halo"- The sixth level in Halo 2.
 * "Halo"- The tenth and final level of Halo 3.

Movies
It has been delayed several times, and is being produced by Peter Jackson.
 * Halo Movie- The upcoming Hollywood feature production.

Novels

 * Halo: The Fall of Reach- The book explaining what happened before Halo: Combat Evolved by Eric Nylund.
 * Halo: The Flood- The novelization of Halo: Combat Evolved by William C. Dietz.
 * Halo: First Strike- The book explaining the SPARTAN programs.
 * Halo Box Set- The box set featuring the three first Halo Novels.
 * Halo: Ghosts of Onyx- The book introducing Onyx.
 * Halo: Contact Harvest- The prequel to the Halo saga set at the beginning of the Human-Covenant War.
 * Halo: The Cole Protocol- The latest known novel that will reveal the location of the Spartan Gray Team.

Books

 * Halo Graphic Novel- The comic book based on the Halo Universe.
 * The Art of Halo- The Halo Artists behind the scenes book.
 * Halo 2: Special Collector's Edition Manual- The manual that comes with Halo 2 Special Collectors Edition.
 * Halo: Combat Evolved: Sybex Official Strategies & Secrets.
 * Halo 2: The Official Game Guide- The guide and straight way for becoming a better player.
 * Halo: Uprising: - The upcoming Halo comic book series by Marvel Comics.
 * Halo 3: The Cradle of Life

Forerunner Constructs

 * The Ark- A construct that creates Halos.
 * The Halos- The Forerunner weapons of absolute last resort.
 * Alpha Halo The first Halo discovered, also known as Installation 04.
 * Installation 04 (II)- A replacement for the one Master Chief destroyed.
 * Delta Halo- The second Halo discovered, also known as Installation 05.