Depreciation:	Reduction in value of the asset due to wear and tear.
Inventory:	Supplies and resources on hand, not yet deployed but in storage.
NPV:	Net Present Value, i.e., present value of investment lessinitial cost.
ROI:	Return on Investment, i.e., revenues or payback lessinitial cost.
RRoR:	Required Rate of Return, i.e., interest rate or minimum expected return for typical investment.