What is a W-shaped star?

Cassiopeia, known as "Ce" in ancient China, belongs to Su Kui among the twenty-eight lodges. One of the main bright stars in the northern sky, located at 0 h56m 42.5 1 right ascension, 60 43' 0.1"declination, with a visual magnitude of 2.8, etc.

First find the five main bright stars arranged in the shape of "W" in Cassiopeia, then the corner in the middle of the letter "W" is the γ star in Cassiopeia.