Predicted impact point

The predicted impact point (PIP) is the location that a ballistic projectile (e.g. bomb, missile, bullet) is expected to strike if fired. The PIP is almost always actively determined by a targeting computer, which then projects a PIP marker (a "pipper") onto a Head-Up Display (HUD). Modern HUDs are focused so the weapon operator will see the marker projected directly over the point of impact, regardless of the position of their eye.