# Fibonacci Retracement, Extension & Trading Strategies

Leonardo Pisano, widely known as the Fibonacci or Fib Man, was a great mathematician of his time. As a young man, Fibonacci was always fond of numbers and studied mathematics extensively. In 1202, Fibonacci came up with a weird number sequence that was derived from Hindu-Arabic numeral systems. Later, the sequence was referred to as the Fibonacci sequence and was comprehensively used by many top traders, hedge fund managers, and investors in their respective trading styles and strategies. In the sequence, after 0 and 1, every number is the sum of the two prior numbers such as 0,1,1,2,3,5,8,13,21,34,55,89, etc. The golden ratio in these sequences is 1.618, as every number is over 1.618 times higher than the preceding number. According to Fibonacci, the golden ratio is 1.618, as it frequently appears in different scenarios in the natural world. For example, the 1.618 number frequently appears in Fine arts, biology, and architecture subjects. According to different scientists, the golden ratio value has been repeatedly found in nature, such as in flowers, human faces, tree branches, and even galaxies.