POS, or Proof of Stake, is a consensus method selecting validators based on staked coins.
PPLNS rewards miners based on the number of shares contributed to the last N shares.
A PSU provides power to ASICs and may be external or integrated.
Payback period is the time it takes for mining hardware to generate revenue equal to its cost.
PoW is a consensus method using computational work to validate blockchain transactions.
Power rate is the cost of electricity used in mining, measured per kilowatt-hour.