The Wikipedia link Jeri posted explains how the symbol came to be adopted in the US. That doesn't negate the fact that in the UK, for older generations at least, the sign has other, overtly political, connotations.

Whilst I am sure that CND believed they were campaigning for peace, there was an alternative view that their demand for unilateral nuclear disarmament could have opened the way to a non-nuclear war. I don't want to get into a debate over the rights and wrongs of either argument, simply to explain that "peace" and "CND" are not necessarily synonymous.

If you're going to use it as a peace symbol, which I am sure is how Google intended it, you also need be aware that it does have other meanings. It is not unambiguous.