### signal:

Curfew
* also help teens plan and organize their life.
* are a disgrace to basic human rights
  - necessary evil for teenagers
  - bells
  - deadlines
  - mandates
  - non-existent, and everyone, young and old, can stay out all night if they want to
  - rules
  - signals
* can help parents and children develop a trusting relationship
  - reduce juvenile crime and keep teenagers out of harm's way
* compromise fundamental rights of the child and are discriminatory on the basis of age.
* give both parents and teens a sense of security.
* have more to do with symbolic politics than rational policy.
* help parents teach valuable lessons to their teens.
* interfere with parental rights of child rearing.

Differential signal
* are immune to common-mode noise, the primary source of system noise.
* use two conductors to carry signals that complement one another.

Digital signal
* are discrete in both time and amplitude
  - discrete-one or zero
  - much different than analog
  - the language of modern day computers
* can tolerate large amounts of noise, interference, and distortion.
* cause even more interference with electronic equipment.
* function in which both time and amplitude are quantized.
* have peak power points much like the peak power point of a television signal.
* tend to reflect off tall buildings, producing multiple images on TV screens.

Drumbeat
* are advocacy
* pulsate in the tropical heat.

Electrical signal
* cause the film to emit relatively low-frequency, pulsed sound waves.
* have many measurable qualities, including intensity and spectral characteristics.
* initiate mechanical contraction and control the strength of that contraction.
* seem to be involved, just as they are with nerve cells.
* travel down the brain cell, where they are changed into chemical signals.
* turn on individual pixels in a matrix of cells.

Electronic signal
* tell the beam when to light up certain areas of the screen.
* travel approximately one foot per nsec.

Fire alarm
* are for fires.
* consist of individual smoke detectors in each room, common areas and laundry room.
* have flashing light and sound.
* is alarm
  - located in buildings

Hand signal
* are difficult to see at night
  - essential for quiet and effective communication
  - the method of communicating on an airship crew
  - very effective ways of communicating with a deaf dog
* can communicate without the use of any speech
  - prevent accidents and save time

Interrupt
* are signals.
+ Game port, Hardware: Video game consoles :: Computer hardware :: Electrical connectors
  * Digital joysticks are easy for programmers to access. Interrupts use the main CPU of the system.

Light signal
* coming through the eyes reset the circadian cycles each day.
* play a crucial role in determining the architecture of individual plants and canopies.
* suffer much less attenuation over distances than electronic signals do.

Nerve signal
* are conducted by an axon with a myelin sheath wrapped around it.
* go crazy and the cord tissue starts to die.

Olfactory signal
* are odors, aromas, or stinks - something that is intended to be smelled.
* play an importan role in communication.

### signal:

Phone number
* Most phone numbers are eight digits with the exception of mobile numbers, which are ten digits.
* Phone Numbers Find phone numbers and addresses of U.K. residents
  - can change rapidly
* Some phone numbers have inherent value that can change over time.
* are a hierarchical structure
  - word
  - as dialed from the United States
  - in the phone book under United States government
  - like potato chips in social settings
  - located in phone books
  - office numbers
* can include parents, friends, pagers, work numbers, etc.
* is the Internet dialup number when service is available.
* lack area codes.