Sequence
A sequence is a manner in which a group of objects, a specific task (or activity), or a combination of letters and terms is organized in an order. They were utilized for security-related matters like encryption, as well as computer systems control. Sequences are similar to codes and algorithms.

Examples of sequences
One simple example of a sequence in the 22nd century was the use of locking sequences on doors aboard . ()

The Xindi weapon had numerous sequences as part of its programming including an arming sequence, firing sequence, inversion sequence, and activation sequence. () Similarly, the Son'a collector had an activation sequence. ()

Iconian technology used color-based key sequences for their control interfaces. On the Iconian homeworld in 2365, Data and Captain Jean-Luc Picard were able surmise the key sequence for launching the Iconian probes was blue-amber-amber-red and for overriding the launch bay doors was blue-blue-blue. ()

The EMH program could be deactivated through its deactivation sequence. In 2371, Captain Kathryn Janeway gave The Doctor control over his deactivation sequence to help him transition to being a true member of the  crew. ()

In 2373, Elim Garak revealed that the encryption transmission code sequence of a Cardassian transmission from the Gamma Quadrant was designed by Enabran Tain and himself. ()

The impulse prestart sequence aboard  starships involved heating up the magnetic plasma guides within the plasma conduits which created superheated plasma, as the temporarily small  was about to find out in 2374. ()

Bio-neural gel packs were grouped in sequences. Sequence six-theta-nine was the location of a number of gelpacks that malfunctioned while Voyager was traveling through a Mutara class nebula later in the same year. ()

Other objects and activities that involved sequences included:
Re-formulating magnetic constrictor for a resonance burst. ()
Borg autonomous regeneration sequencers and nanoprobes. ()
Decompression of a cargo bay. ()
The detonation of a Series 5 long-range tactical armor unit. ()
The ascending portion of a planetary landing. ()
Igniting the ion drive of the Ares IV. ()
Properly shutting down a holoprogram. ()
In an alternate timeline, a future Harry Kim was able to collapse a slipstream with a drive shutdown sequence. ()

Types 
Activation sequence
Airlock depressurization sequence
Amino acid sequence
Arming sequence
Auto-destruct sequence
Auto-separation sequence (Auto-sep sequence)
Automated sequence
Cascade force field sequence
Close down sequence
Connector sequence
Departure sequence
DNA sequence, like nucleotide and base pair.
Doppler sequence
Entry sequence
Environmental compensation sequence
Escape sequence
Evacuation sequence
Evasive maneuver sequence
Genetic sequence
Ignition sequence
Launch sequence, such as for shuttlecraft and torpedoes.
Main sequence
Manual restart sequence
Numerical sequence
Override sequence
Prefire sequence
Reaction sequence
Regeneration sequence
Remodulation sequence
Reverse sequence
Saucer separation sequence
Sequence 010
Shutdown sequence
Shuttle launch sequence
Shuttle preflight sequence
Start-up sequence
Targeting sequence
Testing sequence
Three-dimensional chess sequence, like the Aldabren Exchange.
Transfer sequence
Transport sequence (Transporter sequence)

See also
 Sequencer
 Sequential disruption
Computer technology
Mathematics