Who here has ICE saved on their phone? Or carry an ICE card?
ICE is In Case of Emergency and gives the name and phone number of a significant other who could be contacted should the need arise.
For more details see this site. It's a good idea particularly for bikers as you're not always out with friends.
There is now a little USB dog tag that you can buy that stores; ICE details, photograph. blood type, GP contact details, International language options in case you are abroad, and you can put text files on it.