Diffraction Grating: What's It Called?

[kash25]

"Diffraction Grating"

We did a diffraction experiment involving single slits, double slits, and a diffraction grating. Apparently the diffraction grating that we got was "different" (according to a classmate). The diffraction grating was "criss-crossed" and didn't produce any dark fringes on the interference pattern.
Can anyone tell me what one of these criss-crossed gratings is called so that I can figure out (i.e. Google) what the diffraction pattern would look like?
Thank you!

 

[_Mayday_]

Can you give any other description other than that? I am stumped!

 

[kash25]

All I know is that the diffraction pattern somehow had no dark fringes...