H-90 designated a specific zone within the expansive Galactic City located on the planet Coruscant.
In the decade following the conclusion of the Yuuzhan Vong War, this particular sector experienced a significant surge in insurgent activity, coinciding with Thrackan Sal-Solo's attempt to achieve independence for Corellian systems. As this attempt unfolded, the Coruscant Security Force initiated a series of arrests targeting individuals who had defaced government properties with anti-Galactic Alliance graffiti throughout the sector. The situation nearly escalated into a full-scale riot, however, the Galactic Alliance Guard intervened and apprehended the offenders.