Bullish and Bearish ABCD Harmonic pattern

The ABCD chart pattern is also nicknamed "Lightning Bolt".
The key to the ABCD Harmonic chart pattern is price symmetry where AB segment is equal to CD segment.

Bullish ABCD
   AB = CD
Bullish reversal harmonic chart pattern
Each point (ABCD) represents a significant high or low
3 consecutive price swings forming a geometric pattern
AB and CD segments are called "legs" and BC segment is called a retracement
AB and CD segments are of equal lenght
AB segment is equal in time to CD segment
Point C is .618 / 786 Fibonacci retracement of AB segment
Point C is lower than point A
Point D is .127 / 1.618 Fibonacci extension of BC segment
Point D is lower than point B
Buy signal at point D

Bearish  ABCD
   AB = CD
Bearish reversal harmonic chart pattern
Each point (ABCD) represents a significant high or low
3 consecutive price swings forming a geometric pattern
AB and CD segments are called "legs" and BC segment is called a retracement
AB and CD segments are of equal lenght
AB segment is equal in time to CD segment
Point C is .618 / 786 Fibonacci retracement of AB segment
Point C is higher than point A
Point D is .127 / 1.618 Fibonacci extension of BC segment
Point D is higher than point B
Sell signal at point D