Each junction is reduced to a simple two (or three) letter acronym. Here is a list of all the usual acronyms you're likely to come across. It's fairly self explanatory but you must appreciate the difference between a TR and a RT.
SO | Straight On | SOX | Straight On at Crossroads |
TL | Turn Left | TR | Turn Right |
LT | Left at T Junction | RT | Right at T Junction |
LX | Left at Crossroads | RX | Right at Crossroads |
FL | Fork Left | FR | Fork Right |