"Guideline" is the NATO reporting name for the Soviet SA-2

S-75 Dvina

The S-75 Dvina is a Soviet-designed, high-altitude, command guided, surface-to-air missile system...

 surface-to-air missile.

A guideline is a statement by which to determine a course of action. A guideline aims to streamline particular processes according to a set routine or sound practice. By definition, following a guideline is never mandatory. Guidelines are not binding and are not enforced. ( U.S. Dept. of Veterans Affairs, http://www.va.gov/trm/TRMGlossaryPage.asp )

Guidelines may be issued by and used by any organization (governmental or private) to make the actions of its employees or divisions more predictable, and presumably of higher quality.

Examples or guidelines are:

• EASE Guidelines for Authors and Translators of Scientific Articles
  EASE Guidelines for Authors and Translators of Scientific Articles
  The EASE Guidelines for Authors and Translators of Scientific Articles to be Published in English were first published by the European Association of Science Editors in 2010. An updated version appeared in June 2011...
  
  
• Federal Sentencing Guidelines
  Federal Sentencing Guidelines
  The Federal Sentencing Guidelines are rules that set out a uniform sentencing policy for individuals and organizations convicted of felonies and serious misdemeanors in the United States federal courts system...
  
  
• Guidelines for Examination in the European Patent Office
  Guidelines for Examination in the European Patent Office
  The Guidelines for Examination in the European Patent Office are general instructions, for the examiners working at the European Patent Office as well as for the parties interacting with the EPO, on the practice and procedure at the EPO in the various aspects of the prosecution of European...
  
  
• Medical guidelines
  Guideline (medical)
  A medical guideline is a document with the aim of guiding decisions and criteria regarding diagnosis, management, and treatment in specific areas of healthcare...
  
  
• Human interface guidelines
  Human Interface Guidelines
  Human interface guidelines are software development documents which offer application developers a set of recommendations. Their aim is to improve the experience for the users by making application interfaces more intuitive, learnable, and consistent. Most guides limit themselves to defining a...
  
  
• Programming style guidelines
  Programming style
  Programming style is a set of rules or guidelines used when writing the source code for a computer program. It is often claimed that following a particular programming style will help programmers to read and understand source code conforming to the style, and help to avoid introducing errors.A...