Near the END of EACH runway, a number will be printed. This number is the Runway Identifier. In this case it is Runway 25.
Runways are identified by TWO methods. One being a Numerical value, while the other a Letter.
The Number can be a value of 1 through 36. these are shortened values of the Runway's magnetic heading (basically average the heading to the nearest 10th degree, then divide by ten). i.e. runway hdg. = 047°, Runway ID is Rwy 5. 343° would be Rwy 34.
The Letter is used when there are more than one runways sharing the same Number value. i.e. two parallel runways numbered 15.(see this diagram)
A L is used to identify that that is the LEFT runway.
A R is used to identify that that is the RIGHT runway.
A C is used to identify that that is the CENTRE runway.
The L,R,C applies as if you were on approach for the runway in question.