I heard of kh/s, mh/s, gh/s, th/s, but does this Ph/s mean it's higher than a trillion???
All those kilo, mega, giga are metric prefix.
FYI:
http://en.wikipedia.org/wiki/Metric_prefixYou will see EH/s later (maybe 2 years later)
Blast you beat me to it. I was scrolling down the thread, amazed that nobody had referenced the metric prefix article lol.
I've got a potato that hashes at 20 yoctohashes/second.