For the TNG episode with a similar title, please see "Code of Honor".
For computer code, please see Code (programming).

A code was a system to convert a piece of information into another form. Codes were most often used to send messages or define situations.

An early code that was used for communication on Earth during the 19th century was Morse code. (Star Trek V: The Final Frontier; TNG: "A Fistful of Datas")

The intersat code was used in the 21st century for inter-stellar communications. (TAS: "The Terratin Incident")

Early computer systems on Earth were based on binary code, and later Federation systems could even support trinary code. (VOY: "Hope and Fear")

Codes were often used to encrypt information, including the Federation's Code 2 and Code 3 in the 23rd century; the former had been broken by the Romulans by stardate 3478.2, and thus was replaced by the latter. (TOS: "The Deadly Years")

Many other codes were simply used to transmit information quickly, including Code One alert to indicate a declaration of war or disaster, (TOS: "Errand of Mercy") Code 710 to indicate planetary quarantine, (TOS: "A Taste of Armageddon") Code 1-Alpha-Zero for a ship in distress, (TNG: "Relics") Code Factor 1 for a possible invasion of the Federation, (TOS: "The Alternative Factor") code blue, or blue alert, used to indicate a change in starship flight status, (TNG: "Brothers") code white resuscitation to indicate the need to resuscitate a dead individual, (VOY: "Initiations") Emergency Code 1 for intruder alert, (TNG: "The High Ground") and Transporter Code 14 to destroy an object in a transporter beam. (TNG: "Captain's Holiday")

Codes could also be used to designate messages for specific individuals, such as code 47 meaning "for captain's eyes only." (TNG: "Conspiracy")

Critical ship systems required pass-phrase access in the form of prefix codes (Star Trek II: The Wrath of Khan; TNG: "The Wounded") and authorization codes. (Star Trek: First Contact; VOY: "Deadlock", "Dreadnought", "Cathexis", "Renaissance Man"; TNG: "Chain of Command, Part I")

In 2151, the Vulcans sent encrypted coded secret messages to Enterprise NX-01. It was decrypted by communications officer Hoshi Sato and identified as private Vulcan letters sent to T'Pol. (ENT: "Breaking the Ice")

In August of 2151, ECS Fortunate first officer Matthew Ryan interrogated and tortured a Nausicaan prisoner to get the codes for the shield frequencies of his ship. (ENT: "Fortunate Son")

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