Code

From Memory Alpha, the free Star Trek reference

The term code refers to a system of signals for sending messages or to define a situation.

Such codes may include:

• Code One alert, indicates a declaration of war or other disaster
• Code 2, an encryption format broken by the Romulans
• Code 3, an encryption format unbroken by the Romulans
• Code 47, pertains to a message "for captain's eyes only"
• Code 710, a warning to not approach a planet
• Code 1-Alpha-Zero, indicates a ship in distress
• Code Factor 1, indicates a possible invasion
• Code blue, used to indicate a change in starship flight status
• Code White resuscitation, used to indicate the need to resuscitate a dead individual
• Emergency Code 1, indicates intruder alert
• Intersat code, a 21st century communications code
• Transporter Code 14, issued to destroy object in transporter beam

A code may also refer to a language:

• Binary code, computer language predating trinary code
• Trinary code, computer language following binary code
• Morse code, antiquated means of communication via telegraphs

In addition, a code may also refer to a password to access critical ship systems:

• Command authorization code
• Prefix code

As well, a code may also refer to the various signals used by a series 5 long-range tactical armor unit:

• Confirmation code, used by the Strategic Command Matrix to validate new orders
• Infiltration code, believed to be used by the enemy on Salina Prime to interrupt a Unit's mission

Code may also refer to:

• "Code of Honor", a TNG Season 1