Emergency telephone number

Most public switched telephone networks[2] have a single emergency telephone number (sometimes known as the universal emergency telephone number or the emergency services number) that allows a caller to contact local emergency services for assistance. The emergency number differs from country to country; it is typically a three-digit number so that it can be easily remembered and dialed quickly. Some countries have a different emergency number for each of the different emergency services; these often differ only by the last digit.

9-1-1 is an emergency telephone number used in many countries in the Americas
A fire truck in Ennigerloh, Germany, with the European emergency number 1-1-2 painted on its side
Implementation of the two ITU approved[1] emergency telephone numbers in the world:
  1-1-2
  9-1-1
  1-1-2 and 9-1-1
  Other number or no redirection

In many countries, dialing either 1-1-2 (used in Europe and parts of Asia) or 9-1-1 (used in the Americas) will connect callers to emergency services. For individual countries, see the list of emergency telephone numbers.