Reviewed by Khadija Khartit Fact checked by David Rubin Fibonacci retracements are popular among technical traders. They are based on the key numbers identified by mathematician Leonardo Pisano ...

Learn about Fibonacci retracements and what a mathematical discovery made almost 1,000 years ago can tell you about the direction of your investments.

The Fibonacci channel is a variation of the Fibonacci retracement tool, with support and resistance lines run diagonally rather than horizontally.

Fibonacci retracements use horizontal lines to indicate areas of support or resistance. Levels are calculated using the high and low points of a trend on a chart.

The current setback in Cattle from the 217.47 major Gann square is holding a combination of Fibonacci retracements at 208.30. This is 38.2% back to the 4/9/25 low and 23.6% back to the contract low.

Shares of Tesla Inc. rallied Monday to a fourth-straight gain, but could not sustain gains that carried them above a key Fibonacci retracement threshold for most of the day.