General quarters is a command used aboard Federation starships in the 23rd century, and was the command to prepare for battle as a stage in the red alert that signifies that all personnel must take their battle stations. However, the term can also be applied to other situations and conditions.
- Security Condition 3: This condition indicates that a starship's security has been breached and there is an intruder aboard. This condition is also described as "intruder alert". (TOS episodes: "The Man Trap", "Dagger of the Mind", "The Lights of Zetar")
- Security Condition 4: This condition means that all corridors should be evacuated and sealed off, and all weapons are to be taken account of. (TOS episode: "The Man Trap")