Multiple realities(covers information from several alternate timelines)
Code One Alpha Zero was an increased state of readiness aboard a starship in which the crew prepared for an emergency situation, such as an attack on the starship or answering a distress call.
In the alternate reality, James Kirk ordered a code One Alpha Zero in response to the attack on the USS Enterprise by the forces of Krall in 2263. Security personnel armed themselves with phaser rifles as part of the order. (Star Trek Beyond)
Commander Riker ordered a code One Alpha Zero - "Ship in distress" when it was learned that the USS Jenolan had crashed on the outer surface of the Dyson sphere. (TNG: "Relics")