Or am I simply wrong about what the acronym GP5 stands for?
2 Answers
It's because we're used to the other acronyms of HP5 and MP5, and well, 5GP10 is too weird.
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That makes sense, everything else that is per-time seems to be a "per 5 Seconds". Commented Jul 22, 2012 at 3:07
People do call them gp10s quite frequently, but I believe that before they used to generate it per 5 seconds and then they changed it to 10 seconds for convenience. Old-schoolers still call it gp5s I guess!