Mark to market
The process of calculating the value of a trade or position by referencing market conditions. Conditions could include interest rates, fx rates, stock or futures prices at an exchange.
Margin Period of Risk. The time period over which a risk measure is derived. For instance the time it might take to limit the risk in a portfolio could be 5 days, hence the MPOR would also be 5 days.
A SWIFT message format, read more at https://www.iso20022.org/15022/uhb/finmt527.htm