Luntong Electric 3 is an electronic disk in London, 9:00- 1 1:30, afternoon 1:30-3:00, which means the same as copper. This is the trading time of domestic futures, but there are over-the-counter transactions other than electronic transactions abroad (equivalent to 24-hour trading). Copper refers to the price traded over the counter.

When we say London copper, we mean 3 LUN copper. Represents the average price of the last three months, which can be understood as the middle month, so it has no expiration month, so its graph is always continuous. Therefore, we will only see 3 LUN copper, but there are no 4, 5, 6 LUN copper and so on.