A chartist is someone who believes that there are recurring patterns in the behaviour of market variables such as stock markets, interest rates, gold prices. They argue that by examining past trends in data and charts they can predict future prices.
To some extent chartist predictions may influence expectations so that in the short term there predictions become self fulfilling.
There is a mixed opinion about the efficacy of chart movements. Some people believe the past is a poor and unreliable guide to the future. Sometimes correlations of data can be explained by random chance.
Inflation adjusted price of gold 1968-2019
Note: The Chartist Movement was a political movement in the nineteenth century aiming at the enfranchisement of the working class.