Halo Franchise

Many products and ideas that are set in the Halo Universe contain the word, or are titled, "Halo", named primarily after the Halo Array, a series of massive ring-shaped space installations.

Video Games
The Covenant/Halo/Bungie trilogy - The original first-person shooter trilogy created by Bungie. The Reclaimer/343i trilogy - A second trilogy of the Halo series, created by 343 Industries. A series of Halo spin-off games.
 * Halo: Combat Evolved -The first Halo video game.
 * Halo PC - A Windows and Mac version of Halo: Combat Evolved.
 * Halo: Custom Edition - A free, unsupported upgrade to the Windows port of Halo: Combat Evolved.
 * Halo: Combat Evolved Anniversary - The Combat Evolved remake released November 15th, 2011. The game was made to celebrate 10 years of Halo.
 * Halo 2 - The second Halo video game.
 * Halo 2 Vista - The Windows Vista version of Halo 2.
 * Halo 3 - The third Halo game.
 * Halo 3 Beta - The beta stage of the third installment. 
 * Halo 3: Mythic - The expansion pack of the Halo 3 multiplayer introducing three new maps, included only as a second disc in the Halo 3: ODST case.
 * Halo 3 Legendary Edition - A special edition of the game.
 * Halo 4 - The seventh main installment in the Halo series that picks up right where Halo 3 left off.
 * Halo 5 - The eighth main Halo installment.
 * Halo 6 - The ninth and most likely last Halo installment.
 * Halo: Chronicles (Canceled) - A Halo game developed by Peter Jackson and Wingnut Interactive in association with Bungie. The game was confirmed canceled in the year 2009.
 * Halo Wars - A Halo Real-Time Strategy game developed by Ensemble Studios, set in time long before Halo: Reach.
 * Halo Wars: Limited Edition - The limited edition of the Halo RTS including rare in-game items.
 * Halo 3: ODST - A spin-off game using the Halo 3 engine and set during the time between Halo 2 and 3 and was created by Bungie.
 * Halo: Reach - A main-game prequel to Halo: Combat Evolved, complete with an all-new game engine and developed by Bungie.
 * Halo: Reach Multiplayer Beta - The beta stage of the sixth installment.
 * Halo: Reach Limited Edition - The limited edition package of the game.
 * Halo: Reach Legendary Edition - The ultimate special edition of the game.

Video Game Levels

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

Films

 * Halo: Landfall - A series of live-action short films made to promote the release of Halo 3.
 * Halo - The Hollywood feature movie. It has been delayed indefinitely, and executive producer Peter Jackson and director Neill Blomkamp have both confirmed that their involvement has ended.
 * Halo Legends - A series of seven anime shorts set in the Halo Universe.
 * Halo Wars - The second Hollywood feature production, not yet released.
 * Halo: Faith - The first live-action Independent Halo film by Jared Pelletier.

Novels

 * Halo: The Fall of Reach - A prequel novel to 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 events between Halo: Combat Evolved and Halo 2, by Eric Nylund.
 * Halo Box Set - The box set featuring the three first Halo novels.
 * Halo: Ghosts of Onyx - The book introducing Onyx and the SPARTAN-III Program.
 * Halo: Glasslands - The book following Ghosts of Onyx continuing the story of the final spartans.
 * Halo: Contact Harvest - A prequel to the Halo saga set at the beginning of the Human-Covenant war.
 * Halo: The Cole Protocol - The latest novel set in the earlier years of the Human-Covenant War during the introduction of the Cole Protocol.
 * Halo: Evolutions - Essential Tales of the Halo Universe - A collection of Halo stories on various subjects.
 * Halo: Cryptum - The story of the Forerunners, by Greg Bear. Released January 4, 2011.

Music

 * Halo: Original Soundtrack
 * Halo 2: Original Soundtrack
 * Halo 3: Original Soundtrack
 * Halo 3: ODST Original Soundtrack
 * Halo Wars Original Soundtrack
 * Halo Legends Original Soundtrack
 * Halo: Reach Original Soundtrack

Books

 * Halo: Combat Evolved: Sybex Official Strategies & Secrets.
 * The Art of Halo - A behind-the-scenes art book, focusing on the evolution of Halo 2.
 * Halo 2: Special Collector's Edition Manual - The manual that comes with the Halo 2 Special Collectors Edition.
 * Halo 2: The Official Game Guide
 * Halo 3: The Cradle of Life - A short webcomic made to advertise Halo 3.
 * Halo 3: The Official Strategy Guide
 * The Art of Halo 3 - A behind-the-scenes art book, focusing on the evolution of Halo 3.
 * Halo Encyclopedia - The encyclopedia based on the Halo universe.
 * Halo: Reach Official Strategy Guide - The strategy guide for Halo: Reach.

Comic books

 * Halo Graphic Novel - A comic book containing various stories set in the Halo Universe.
 * Halo: Uprising: - A Halo comic book series by Marvel Comics, set between the events of Halo 2 and Halo 3.
 * Halo: Helljumper - A comic series based on the ODST.
 * Halo: Blood Line - A comic series based on Team Black.
 * Halo: The Fall of Reach - a comic book adaptation of the novel The Fall of Reach, comprised of three story arcs:
 * Boot Camp
 * Covenant
 * Pillar of Autumn

Forerunner Constructs

 * Installation 00 - A place where all Halos can be activated simultaneously.
 * The Halos - The Forerunner weapons of absolute last resort.
 * Installation 01 - One of the multiple Halo rings not visited during the series, but seen in holograms.
 * Installation 02 - One of the multiple Halo rings not visited during the series, but seen in holograms.
 * Installation 03 - One of the multiple Halo rings not visited during the series, but seen in holograms.
 * Installation 04 - The first Halo discovered, also known as Alpha Halo.
 * Installation 04B - A replacement for the original ring that Master Chief destroyed.
 * Installation 05 - The second Halo discovered, also known as Delta Halo.
 * Installation 06 - One of the multiple Halo rings not visited during the series, but seen in holograms.
 * Installation 07 - The main setting for the novel Halo: Primordium.