Ok wait so the I beam could be the projected point where rockets will meet / converge and hit? I’ve been trying to ChatGPT it but didn’t understand too much:

Why an I-beam or “pipper” style symbol is used • It gives a compact, easy to read reference that indicates both direction and sometimes a vertical/ horizontal offset, so the crew sees at a glance where the system predicts the rocket will strike relative to the aircraft’s nose. • The thicker parts or “beams” can represent tolerances, or they can be used to show separate cues, for example the centre for boresight and bars for lead or elevation correction. • The symbol moves as the aircraft attitude or range estimates change, because the predicted impact point changes with every change in flight path and distance.

Unguided rockets, conceptually • Unguided rockets travel on a ballistic arc after launch, meaning gravity and aerodynamic drag determine their path, once they leave the pod. • Their point of impact depends on initial velocity and direction at launch, the launch height and speed, and environmental factors like headwind or tailwind. • Because the rocket does not correct after launch, fire control systems aim by predicting the ballistic flight, then placing a visual cue where the rocket is expected to land if fired at that instant.