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Decades of fighting against an increasingly adaptive enemy has forced the Spartans to develop shorthand communications system for use against the Covenant. Many of these ideas are known and understood by the Spartans only, even as well-guarded secrets. These also sometimes make normal conversations with the Spartans impossible, as they can do a great deal inside their MJOLNIR armor that is indistinguishable from the outside.

Spartan-II Terms

Oly Oly Oxen Free

Oly Oly Oxen Free is the Spartans' best-kept secret. It is their all clear signal which virtually no non-Spartan knows; the only known surviving non-Spartans being Cortana and Doctor Halsey. Deja also knows it, as she taught this to them, though her fate is unknown as she was situated on the now conquered Reach. This allows them to use it with guarded impunity over the COM to make others aware of their presence, location, or as an all-clear signal. It is a simple seven note tune that can be whistled.[1][2] It is this signal that Master Chief picks up on when he and his companions return to Reach after the events on Alpha Halo and discover that the Covenant didn't glass the entire planet.[3]

Spartan "Smile"

Having grown up as soldiers, the Spartans kept their emotions to themselves, always controlling "bursts of emotion". The closest thing to an emotional symbol is the "Spartan smile," used in place of a smile. The Smile consists of a quick swipe of a smile across ones own faceplate or a teammates with one or two fingers. The former was usually used in place of the latter.[4]

Open COM

The Spartans signal to one another to open private COM frequencies by the flick of a finger. It is a move performed only in non combat situations, when the Spartans can pay attention to one another's movement. This way they can talk to one another without any external people hearing their conversation.[5][6]

"Attention!"

The Spartans will click a COM channel twice to get the attention of their teammates if they need assistance. [7]Recent improvements in Covenant sensor technology have made this gesture increasingly impractical, as Covenant will be made aware of a Spartan's location if that Spartan uses the COM in the presence of a Covenant Vehicle.[8]

"Relax"

The Spartans sometimes console one another nonverbally with a simple bump or guesture of the shoulder. They have become used to their MJOLNIR armor, and so each move they make is deliberate. Hence, the gesture is easy to recognize and understand.[9]

"Trouble Ahead..."

The Spartan scouts signal trouble ahead with a slight shake of the head from side to side.

"Stay Cool"

A short lateral cut with the hand across the chest or mouth area signals to stay calm.[10]

"Inspect Armor"

By making a circle in the air with one to two fingers to turn around, a Spartan signals that they want to visually inspect another Spartan's armor. Even if the computer diagnostics report everything as fine, Spartans don't take chances with their armor or any other machinery and still visually inspect each other's armor.Cite error: Closing </ref> missing for <ref> tag

The Finger

It has been noted in the book Halo: Ghosts of Onyx that Kelly makes "An ancient and arcane gesture with one finger" to the sentinels. This could possibly be the same as today's middle finger, since by 2552 standards it would be considered ancient.

Spartan-III terms

Welcome

Spartans "welcome" one another by swiping two fingers over their faceplate. This is a smooth, silent way to say hello, and is a toned down version of the Spartan-II's "Spartan Smile."

Unknown Ahead

Spartans on patrol who spot something ahead that is not immediately discernible as ally or enemy will signify it to their teammates by making a hand signal with a thumb pressing into the palm and the other fingers inwardly curled.

"Heavy"

This sign was only used once by Lucy in Ghosts of Onyx. This was signaled by holding up both palms, and making a down-and-up motion. Though only used once, it is indeed a Spartan-III sign.

Sources