From Halopedia, the Halo wiki
Though the name of the unit implies that it equates with one revolution of High Charity (or Installation 04, for the Forerunner unit), it is unknown how this unit is standardized, as both installations are capable of moving within and between systems.
List of appearances
- Halo 2
- Conversations from the Universe (First appearance)
- Halo: Evolutions - Essential Tales of the Halo Universe