Short

When you open a Short position on Unlimited Leverage, you're simulating the borrowing of an asset and selling it at the current price (Entry Price). Later, when you close the position, you're simulating the buy-back of the same amount of the traded asset at a new price (Mark Price) to return to the lender.

If you can buy it back for less than what you sold it for, you make a profit.

Short positions are profitable when the Mark Price of the asset is lesser than the Entry Price.