Most Accurate Forex Indicator

indicator
A thing, esp. a trend or fact, that indicates the state or level of something
A device providing specific information on the state or condition of something, in particular
A gauge or meter of a specified kind
index: a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time
a signal for attracting attention
a device for showing the operating condition of some system

accurate
(of a piece of work) Meticulously careful and free from errors
(accurately) with few mistakes; "he works very accurately"
(of information, measurements, statistics, etc.) Correct in all details; exact
(of an instrument or method) Capable of giving such information
conforming exactly or almost exactly to fact or to a standard or performing with total accuracy; "an accurate reproduction"; "the accounting was accurate"; "accurate measurements"; "an accurate scale"
(of ideas, images, representations, expressions) characterized by perfect conformity to fact or truth ; strictly correct; "a precise image"; "a precise measurement"

forex
Foreign exchange
The foreign exchange market (forex, FX, or currency market) is a worldwide decentralized over-the-counter financial market for the trading of currencies.
The market in which participants are able to buy, sell, exchange and speculate on currencies. The forex markets is made up of banks, commercial companies, central banks, investment management firms, hedge funds, and retail forex brokers and investors.
The foreign exchange (also known as "forex" or "FX") market is the place where currencies are traded. The overall forex market is the largest, most liquid market in the world with an average traded value that exceeds $1.9 trillion per day and includes all of the currencies in the world.