I hadn't realised until recently that a PB (personal best) is not a universal term. Near enough every blog I browse notes PR (which I assume to mean 'personal record'), when did this happen? Is it an American / British alternate? Or, and I hope I am wrong, a move towards another PC (politically correct) phrase? My assumption there being that somewhere someone perhaps thought 'best' was too strong a word and opted for 'record' instead.
I simply don't know the answer, and would love to know.