Seven

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"Some of you may be wondering - "What's up with this unhealthy obsession with the number 7?" This page offers some insights."

— Brian Jarrard, linking to this very page^[1]

"Cause that's the best number. It's like rock. Nothing beats rock or 7."

— Michael Wu

Bungie Studios has long enjoyed using the number Seven (7) in its games in many prominent ways^[2]. Ensemble Studios and authors also have certain obvious seven references in their works about Halo. While almost anything can be made into a reference to something with effort or constructed accidentally through pareidolia, the following attempts to list the intentional references Bungie placed into Halo for the fans to find. As such, not all of these references may be fully accurate, and many of them may be proven to be false at any time. Bungie's obsession with the number seven may be attributed to (or be a determining factor) why John-117 is considered lucky, as 7 is considered a lucky number. In spite of the fact that the number seven is featured extensively in Bungie's work, it has generated an aura of apophenia. This cultural nuance can be compared to the 23 enigma.

Halo Series

Cortana has 7 letters in it.
John-117's service tag may be another 7 reference (1x1x7=7).

Halo: The Fall of Reach

Main article: Halo: The Fall of Reach

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Halo: Combat Evolved (and Halo: The Flood)

Main articles: Halo: Combat Evolved, Halo: The Flood

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Halo: First Strike

Main article: Halo: First Strike

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Halo: Ghosts of Onyx

Main article: Halo: Ghosts of Onyx

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Halo 2

Main article: Halo 2

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Halo 3

Main article: Halo 3

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Cortana Letters and Transmissions

Main articles: Cortana Letters, Transmissions

Cortana signs one letter with seven 'X's and 'O's.
Cortana sends eight emails. But Letter Three was likely never intended, so seven messages were planned.

I Love Bees

Main article: I Love Bees

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Halo: Contact Harvest

Main article: Halo: Contact Harvest

There were seven space elevators of the Tiara.
Seven main maglev train lines led out from each base of the space elevators.^[3]
Prophet Senior Ministry staffers could manage to travel in their gravity thrones in groups as small as seven.^[4]
The first space elevator to collapse was the seventh elevator.
Later Loki changed the five minute interval for the containers to seven minutes.
Sif's electronics were stored in seven towers in the Tiara's control room.

Halo: The Cole Protocol

Main article: Halo: The Cole Protocol

Seven ODST's were killed during the attack on the Redoubt.

Halo Wars

Main article: Halo Wars

In Halo Wars, both the UNSC Fortress and Covenant Citadel possess 7 expansion sockets.
There are 7 Elites deactivating camouflage in the first Halo Wars Trailer
There are 7 types of buildings for each UNSC and Covenant.
There are 7 power nodes that you can destroy to make the super scarab's searchlight move slower on the level Scarab.
At the beginning of Relic Approach the lockdown on the base will not end and the main gate will not open until the player trains five more squads of marines, bringing the total to seven.
Following the events aboard the UNSC Prophecy, Sergeant Forge required seven doses of anti-radiation treatment.^[5]