From Wiktionary, the free dictionary
open position (plural open positions)
- (finance) An active trade with unrealized profits and losses that has not yet been offset (“closed”) by a corresponding equivalent deal.
2011, Mark Galant, Brian Dolan, Currency Trading For Dummies, John Wiley & Sons, →ISBN, page 52:Mark-to-market is the calculation that shows your unrealized P&L based on where you could close your open positions in the market at that instant.