Last year, one of my friend suddenly felt dizziness. The condition got worse that we all prepared to get him into emergency. While we were doing so, I wanted to call his wife. I looked by her name into his cell, I could not get her number. He must have put under some kinda nick name.
I could not find it.
Imagine a situation when you needed help from stranger in such condition, s/he had to dial your relative or contact person. Surely, they do not have idea on what to do with your cell contacts. You can have hundreds of 'em.
The solution is to have one contact number added as ICE (in case of emergency).
Nobody knows when you may need help!
I think the cell software should be designed in such a way that user has to (optional) enter the ICE number when used for the first time. Having ICE on mobile can be helpful.
Helpful, especially when someone wants to get help for you.
This article suggests the idea of having same acronym in different companies, bringing uniformity in it's use.