Fibonacci analysis is used to monitor the extension or retracement of price in a chart pattern or the extension of time based on the prior period.
‘Named after Fibonacci, also known as Leonardo of Pisa or Leonardo Pisano, Fibonacci numbers were first introduced in his Liber abaci in 1202. The son of a Pisan merchant, Fibonacci traveled widely and traded extensively. Math was incredibly important to those in the trading industry, and his passion for numbers was cultivated in his youth.’ LiveScience
If you would like to learn about Fibonacci time & price for trading then consider reading: