I feel like this ought to be a FAQ, but because of the abundance of articles on Grade Point Average coming out of the US, it's extremely difficult to search for. I have a micro switch with rather difficult to read labelling on it, but which clearly shows a current rating of 0.1GPA (and 125 VAC): I'm used to seeing a simple 'A' after current ratings. What does the 'GP' stand for in this instance?