Rally Point Zulu

 was a point in the space surrounding Reach that was designated by the United Nations Space Command as a location for all UNSC warships in the Reach, Tantalus, and Jerico Systems to rendezvous and repulse inbound Covenant warships that were about to attack Reach.

The appropriate UNSC vessels were alerted by UNSC Alpha Priority Transmission 04592Z-83 sent by Admiral Roland Freemont of FLEETCOM.