What are some terms used regularly when referring to currency?

Answer:

Watermark – An embossed image that can be seen when held up to a fluorescent light.
Counterfeit – Currency that has been illegally copied or imitated
Duty Cycle – The amount in one cycle that a machine can handle.
Hopper – The place where bills are set before they are counted.
Ultraviolet Light (UV) – This type of light is usually blue or purple in color which reveals whether a bill is counterfeit.