Two-Stage Trigger
A trigger with a deliberate first stage of light take-up that stops at a wall, then a defined second stage that breaks the shot.
A two-stage trigger splits the pull into two parts. The first stage is light, intentional travel that takes up slack and brings the sear to a firm wall. Press through that wall and the second stage breaks at the set trigger weight. The first stage gives a tactile cue that you are right on the edge of firing.
Many shooters find a two-stage easier to run under stress and in field positions, because you can take up the first stage early and then break a clean shot when the reticle settles. The alternative is a single-stage trigger, which removes the take-up entirely. Both can be excellent; the choice is feel and discipline.