A standing order was a type of military rule which remained in effect until rescinded and did not have to be re-issued in each individual situation.
By 2267, Captain Kirk had standing orders to investigate all quasars and quasar-like phenomena. (TOS: "The Galileo Seven")
In 2268, it was standing order of the Ekosian SS to interrogate and then execute captured spies. However, Chairman Eneg overrode this order in the case of Captain Kirk and Spock. (TOS: "Patterns of Force")
In 2290, Captain K'Temoc had standing orders to fire on all Federation ships, when he and the crew of the IKS T'Ong were placed in cryogenic suspension. (TNG: "The Emissary")
According to Beverly Crusher in 2364, it was against Captain Picard's standing orders to let children such as Wesley Crusher onto the bridge. (TNG: "Encounter at Farpoint")
The same year, Captain Picard assured a crying Natasha Yar that according to a new standing order, tears were permitted in the penalty box. (TNG: "Hide and Q")
Between 2371 and 2377, Kathryn Janeway had never changed her standing order to Neelix for black coffee in the mess hall. (VOY: "Shattered")