The suture that goes in between the two parietal bones (left and right) is called the saggital suture. That is the main suture that runs in the middle of the top of your head. The parietal bones articulate with the occipital bone at the lambdoidal suture and with the temporal bones (left and right where the ears are), at the squamosal suture. Finally the parietal bones both meet with the frontal bone at the coronal suture. But the main suture between the parietals again is the saggital suture.
Lambdoidal suture connects the two parietal bones together.