What are AX Build Numbers

What are Axapta Build Numbers, What are AX Build Numbers Dynamics AX 2012 R3 Build number    Version 6.3.42.13              2012 R3 CTP4 6.3.126.8              2012 R3 CTP5 6.3.155.6              2012 R3 RC0 6.3.164.0              2012 R3 RTM Dynamics AX 2012 R2 Build number    Version 6.2.158.0              2012 R2 6.2.1000.156       2012 R2 Cumulative Update 1 (CU1) 6.2.1000.1437     2012 R2 Cumulative Update…