Emergency contact (ICE)

Not a legal requirement, but this is certainly a good idea. In case of emergency (ICE) is a programme that enables first responders, such as paramedics, fire fighters, and police officers, to identify victims and contact their next of kin to obtain important medical information. The programme was conceived in the mid-2000s and promoted by British paramedic Bob Brotchie in May 2005. It encourages people to enter emergency contacts in their mobile phone address book under the name “ICE”. Alternately, a person can list multiple emergency contacts as “ICE1”, “ICE2”, etc.

Source http://en.wikipedia.org/wiki/In_case_of_emergency