Gibbs:
The term Pattern refers to the "pattern" of aerobatic maneuvers that are performed sequentially, usually in aerobatics competition or in practicing for competition. The official term is Radio Control Precision Aerobatics, but Pattern is what everyone calls it. Pattern competition has been around for over 50 years.

As for whether the Yak you have would be good for Pattern, it would not meet the size (2M span/length), weight (5K) or (most likely) the noise rules (94dB over grass @3M) for competition. Could a G62 handle a 30% aerobatic model like the 30% Yak? Yes, more then likely you could fly through most any aerobatics maneuvers you want to try with it.