Priority one

Priority one was a type of communiqué used within the Federation, including Starfleet, that noted messages of high priority.

In 2269, Uhura sent a priority one call to Governor Robert Wesley of the planet Mantilles to warn him of the danger of an approaching cosmic cloud. 

In 2285, Captain J.T. Esteban instructed his communications officer to send a coded priority one message for Starfleet Commander. In his message he stated: "Federation science vessel Grissom arriving Genesis planet, Mutara sector, to begin research. J.T. Esteban, commanding." 

Prime Minister Nayrok sent the Enterprise-D a priority one message on a priority channel, after Roga Danar escaped from the ship and captured an Angosian police shuttle. 

In 2366, Captain Jean-Luc Picard received a priority one message on a secured channel from Admiral Haden concerning the Romulan defector Alidar Jarok. 

Later that year, the Enterprise-D's mission to contact the living spacecraft "Tin Man" was classified as priority one. The Enterprise was to observe minimum contract procedures. 

The following year, Data sent a priority one message to Worf ordering him to arrest the brainwashed Geordi La Forge in order to prevent him from assassinating Governor Vagh. 

In 2369 the Federation runabout USS Rio Grande received a priority one broad band distress signal from the Kobliad transport ship Reyab. 

Admiral Nakamura sent a priority one message to Captain Picard in 2370. Worf was ordered by Picard to send the message to Doctor Crusher's office in sickbay. Nakamura informed Picard that he initiated a fleet wide yellow alert, because Starfleet Intelligence has picked up some alarming reports from the Romulan Star Empire. 

In 2372, Lieutenant Commander Jadzia Dax received a priority one message from Starfleet Intelligence which stated that the Klingons placed Orbital defense systems in Cardassian territory.