What is "reticles"

Usage examples of "reticles".

Well, I treat my casings and slugs, darling, he said to her silently as the reticles of the telescope picked out a pretty target on her neck.

And the numbers it flashes up on the CRT tell you where to look on your reticles, and you should see your computed landing site right there, behind the mark.

Once outside again, he would come under the targeting system of every weapon on the corvette's hull-along with the targeting reticles of every skip within firing distance.