A large sell order that is placed on any category of prices.
Sell Wall is a term that is used to describe a large sell order placed on any price category. Whales, the users responsible for these orders, sometimes use these orders to forcefully restrain asset prices and intimidate other traders. This eventually causes the price(s) to drop considerably. In other words, sell walls generally serve as price ceilings, alternatively known as resistance.
Traders can, however, choose whether they desire to purchase or sell at the established price since a sell wall signals an increase in the supply, thereby stimulating demand.