911, sometimes written 9-1-1, is an emergency telephone number for Argentina, Canada, Dominican Republic, Jordan, Mexico, Palau, Panama, the Philippines, Sint Maarten, the United States, and Uruguay, as well as the North American Numbering Plan (NANP), one of eight N11 codes.

In times of crisis and natural disasters, amateur radio is often used as a means of emergency communication when wireline, cell phones and other conventional means of communications fail.

Bluetooth is a wireless technology standard that allows the exchange of data between devices over short distances.

Cardiopulmonary resuscitation (CPR) is a life-saving emergency procedure performed on individuals whose heart or breathing has stopped.

Emergency medical services (EMS), also known as ambulance services or paramedic services, are emergency services that provide urgent pre-hospital treatment and stabilisation for serious illness and injuries and transport to definitive care.

Emergency services and rescue services are organizations that ensure public safety, security, and health by addressing and resolving different emergencies.

An emergency telephone is a phone specifically provided for making calls to emergency services and is most often found in a place of special danger or where it is likely that there will be a need to make emergency calls.

The Wikipedia page for the European Union provides an in-depth overview of the supranational political and economic organization that consists of 27 member states located in Europe.