"A $100 bill can be referred to simply as a "bill" ("He gave me five bills for the merchandise"), or as any of several variations on "century" (meaning 100), most commonly "C" or "C note." Another term is "yard," perhaps from the word's meaning of "a lot""He reeled off yards of data..."

A thousand dollars, of course, is a "grand," or a G for short.
"

All these abbreviations are used by FX traders for any currency.

You can add another
'Bar' for 1 million

Now tell me where 'bar' comes from?