In Axapta, choose the option About Microsoft Business Solution-Axapta in the Help pull-down menu, you can see the Axapta build number information, e.g. Microsoft Business Solution-Axapta 3.0 Build # 1951.6710/514-320 SP4/OP023-196.
What does it stands for?
The first part 1951.6710 is the kernel build number.
The second part 514-320 SP4 is the application build number.
The last part OP023-196 is the localization build number.