RAT = ProCo Rat (distortion)
MXR = MXR Micro amp (boost)
DD5 = Boss DD5 Delay
RV3 = Boss RV3 Reverb
and all the 1A, 2A, 3A, 2C, 3C etc. is all the presets on the Line6 DL4 delay, if you google jonny buckland setlist, you are going to find another one with the text: L61A, and that refers to the Line6 DL4. On that other setlist, you can see that the settings for Square One is L61A/L62A and that is the exact same as the list you posted