It looks like you're asking about the "long" and "short" trade signs or positions in the context of trading, often related to financial markets such as stocks, commodities, or cryptocurrency.
Long trade: A "long" position refers to buying an asset with the expectation that its price will rise over time. Traders profit from a long position by buying at a lower price and selling at a higher price.
Short trade: A "short" position involves selling an asset that you do not own, with the intention to buy it back later at a lower price. Traders profit from shorting by selling at a higher price and buying back at a lower price.
Could you clarify what you're looking for specifically in terms of "Df" or "long long"? That would help me assist you better.