SWIFT ISO 15022 - Code SLOS Financial acronyms The entire acronym collection of this site is now also available offline with this new app for iPhone and iPad. Meaning Stop Loss: Order to sell that sets the sell price below the market price. Usages Message type Field number Tag MT502 (Order to Buy or Sell) 18 22a (Indicator) MT513 (Client Advice Of Execution) 35 22a (Indicator) MT576 (Statement of Open Orders) 43 22a (Indicator)