USD/MUR is the currency pair comparing the price of USD/MUR to that of USD/MUR which seeks to find out how many MUR are needed to acquire a USD. After recent events that figure is at 44.80000.
Note that in this case USD is the transaction currency or the base currencyand the MUR has the denomination of quote currency or counter currency.
45.00000 is the highest price this pair has been at in the last few hours and 44.87500 is the lowest price it has been found at . This means that it has had a variation of 0.15000, which translated into a percentage is a 0.33000%.