Nickel refers to the nickel variety of LME London Metal Exchange.

London Metal Exchange (LME) is the largest non-ferrous metal exchange in the world, established in 1876, trading copper, aluminum, lead, zinc, nickel and aluminum alloys.

LME adopts international membership system, and more than 95% of its transactions come from overseas markets. Trading varieties include copper, aluminum, lead, zinc, nickel and aluminum alloy. The trading mode of the exchange is open outcry trading, which is carried out in the "market", also known as "floor trading", and its operation is supported by the 24-hour telephone order market and LMEselect screen trading system. LME publishes a series of prices every day, which are used as the pricing basis of spot metal contracts in the operation.