What Is an Indicators in financial markets?

Indicators are statistics used to measure current conditions as well as to forecast financial or economic trends.

In the world of investing, indicators typically refer to technical chart patterns deriving from the price, volume, or open interest of a given security. Common technical indicators include moving averages, moving average convergence divergence (MACD), relative strength index (RSI), and on-balance-volume (OBV).
In economics, indicators usually refer to pieces of economic data used to measure the overall health of the economy and predict its direction. They include the Consumer Price Index (CPI), Gross Domestic Product (GDP), and unemployment figures.