Name:

1) A set of specifications on the size, shape, and configuration of a computer hardware compent such as a cas, power supply, or a motherboard:
Riser Card ATX Form Factor BTX

2) Most popular form factor used today:
ATX BTX Micro ATX Flex ATX

3) Has newer technology than ATX, also created after ATX:
NLX Micro ATX Flex ATX BTX

4) Allows maximum Flexibility in the size and shape of cases and motherboard:
NLX Micro ATX Flex ATX BTX

5) Higher quality, believed to replace ATX:
Flex ATX BTX NLX ATX

6) Low End personal computer motherboard, designed to improve an older and similar form factor:
NLX ATX Flex ATX BTX