What feature is formed in a convergent boundary?

If you're looking at a convection zone along coastal areas you'll look for subduction zones, trenches, accretionary wedges, volcanic activity, seismic activity, mountain building activity, island creation (think Japan), and possibly exotic terrains to name a few. If you're looking at convergent boundaries on continental land you'll generally find mountain building (think Himalayas), faulting, and seismic activity; not as much volcanism here since the crust is even think to support the mountain zone.

There isn't specifically one feature to be found because you have three options for convergent boundaries: continental-oceanic, continental-continental, and oceanic-oceanic.