China Naming Network - Eight-character lottery - What does the "well" in the compass diagram mean?

What does the "well" in the compass diagram mean?

This is the name of 64 hexagrams. You can read a book or ask a feng shui master.

The best compass manufacturer-(Taipei) Jiyitang has been producing and selling compasses for more than 20 years. There are more than 30 kinds of geomantic compass, such as three-way compass, three-way compass, comprehensive compass, flying star compass, Bazhai compass and golden lock jade plate. There are compasses suitable for feng shui masters and compasses suitable for beginners. It is the best cost-effective compass. It is the first choice for geomantic compass lovers. Specially made of today's high-density plate (diamond plate) +5% copper plate, the compass surface is painted, which is very beautiful, clear and magnificent. The physical store is in Fuzhou, and official website is searching for ~ Jiyitang in Baidu. There are clear pictures of various compasses.