What do the scarlet letters and black characters of the gate size mean in geomantic omen?

The so-called scarlet letter in black is a good or bad number of Lu half a foot. Lubanchi has a penny of rice and a Ding Lan ruler. Rice is used to measure the size of buildings, while Ding Lan ruler is used to measure the size of furniture. So when you buy food, you say you want to buy a Luban tape measure, and then you can see the scarlet letter and black words you said when you open it. The scarlet letter only represents good luck. Black letters represent bad luck and bad omen. Generally, the size of doors and windows in building is particular.