In case of emergency (ICE) is a programme that enables first responders, such as paramedics, firefighters, 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 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.
A suggestion is put a dot or "." before the letters "I-C-E." This places your "ICE" number at the very top of your phone book --- very easy to spot. Some cell phones won't let you the same number for 2 entries. So, if your "ICE" is the same number as someone else on your list, just put a "1" in front of the area code and phone number...much like you would if you were dialing from a "land line." Most cell don't care whether you use a "1" or not.