It's not shown. We have one SP hybridized orbital pointing into the page into the board, and it's bonding to one of the S's. One is coming out of the board, and that is bonding to a second one S orbital. And a third is lying on the board, and it's bonding with a third one S orbital. And here we have our BH three molecule that also looks like this. So once again, the boron nucleus, one bond is coming out of the page.