That u is probably supposed to be that u-shaped Latin character, so it's still "micro" ATX.
is there a difference?
i want this mobo (http://usa.asus.com/products4.aspx?modelmenu=2&model=766&l1=3&l2=15&l3=210)
but its uatx and i got matx . this is my chasis (http://www.ahanix.com/plasma.html)
does it fit?