A single zigzag in a bull market is a simple three-wave declining pattern labeled A-B-C. The sub wave sequence is 5-3-5, and the top of wave B is noticeably lower than the start of wave A, as illustrated in Figures 1 and 2.

In a bear market, a zigzag correction takes place in the opposite direction, as shown in Figures 3 and 4. For this reason, a zigzag in a bear market is often referred to as an inverted zigzag.
Occasionally zigzags will occur twice, or at most, three times in succession, particularly when the first zigzag falls short of a normal target. In these cases, each zigzag is separated by an intervening “three,” producing what is called a double zigzag (see Figure 6) or triple zigzag. These formations are analogous to the extension of an impulse wave but are less common.
The correction in the Standard and Poor’s 500 stock index from
January 1977 to March 1978 (see Figure 7) can be labeled as a double zigzag, as can the correction in the Dow from July to October 1975 (see Figure 8). Within impulses, second waves frequently sport zigzags, while fourth waves rarely do.
R.N. Elliott’s original labeling of double and triple zigzags and double and triple threes (see later section) was a quick shorthand. He denoted the intervening movements as wave X, so that double corrections were labeled A-B-C-X-A-B-C. Unfortunately, this notation improperly indicated the degree of the actionary sub waves of each simple pattern. They were labeled as being only one degree less than the entire correction when in fact, they are two degrees smaller. We have eliminated this problem by introducing a useful notational device: labeling the successive actionary components of double and triple corrections as waves W, Y, and Z, so that the entire pattern is counted “W-X-Y (-X-Z).” The letter “W” now denotes the first corrective pattern in a double or triple correction, Y the second, and Z the third of a triple. Each subwave thereof (A, B or C, as well as D or E of a triangle — see later section) is now properly seen as two degrees smaller than the entire correction. Each wave X is a reactionary wave and thus always a corrective wave, typically another zigzag.
Courtesy R.N. Elliott’s .This content copyrights protected by R.N. Elliott’s Text Book.