bullseye
n. countablen. the center of a target in games like darts or archery. It is the best place to hit because it gives you the most points.
n. the central, most valuable part of a target in archery, darts, or other shooting sports. Often used metaphorically to describe a perfect or highly accurate result.
He hit the bullseye on his first try.
The archer's arrow landed perfectly in the bullseye, earning her a standing ovation from the crowd.
While the initial proposal was ambitious, the final report hit the bullseye by addressing every concern the board had raised during the preliminary negotiations.
From bull's + eye. May have come from the practice of English archers shooting an arrow through the eye socket of a bull's skull as a test of skill. The connection to philately comes from the shape of the key plate or vignette.