XYZ-Wing
tough
This is a variation of XY-Wing in which the XY-cell also contains Z as an option. In this more restrictive situation, only cells which share containers with all 3 cells (XYZ, XZ, YZ) cannot contain Z, as in the highlighted cells shown here.
Here’s a sample puzzle from my collection with an XYZ-Wing, whose three cells I’ve highlighted. Can you spot which number you can erase?