Wu belongs to gold or wood?

In the learning of names, the five elements are divided according to the "five grids", and the five grids come from the number of strokes of names, 1-2 belongs to wood 3-4, fire 5-6 belongs to soil 7-8 belongs to gold 9- 10 belongs to water. In the seven paintings of Wu, Tianjia 1 is 8. Of course, the five elements belong to gold.

There are differences between the five elements of naming science and the five elements of geomantic omen, so don't confuse them.