An Earpiece is the chosen technology of the Aries.
An Earpiece is a small device Arieans get pierced into their right ears.
When an Ariean turns seventeen, she is considered an adult and is issued an Earpiece (seventeen is also the age at which every Ariean commits two years to the army). The Earpiece functions similarly to a computer, only its images aren’t projected as holograms: instead they are screened inside the person’s mind, where no one else can see them. Since Arieans are masters in the art of war, an Earpiece allows troops to communicate with each other discreetly in the field.