FX, PH, SR, VT, PB, HB

These are the standard abbreviations for the six men's artistic gymnastics events, listed here in Olympic competition order.  Whenever you're at a sanctioned USAG meet, this is the order the rotations will follow.

FX: Floor Exercise

PH: Pommel Horse (and mushroom)

SR: Still Rings 

VT: Vault (Table)

PB: Parallel Bars

HB: Horizontal (High) Bar

The All Around Score (AA) is the combined score from all six events.