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ATX is the form factor.
ATX
There are no similar form factors to ATX if you're talking about a slimline. Slimline form factors are NLX and LPX. The form factors to ATX are BTX, Micro-ATX, and Flex-ATX. There is no correlation between slimline and ATX.
ATX is the form factor which Motherboards, Computer Cases and Graphics Cards use to standardise sizing. An ATX form-factor Motherboard will fit an ATX Case, and an ATX Graphics Card will fit in the case as well.
MB is ATX form factor.
ATX
Before the ATX form factor was released, XT, AT, and BabyAT were the most common standard form factors.
atx,nlx,btx
ATX.
ATX
The three form factors for desktop system boards are: ATX, and BTX and NLX
Atx, btx, nlx