A reticle is a net of fine lines or fibres in the eyepiece of a sighting device, such as a telescope, a telescopic sight, a microscope, or the screen of an oscilloscope. The word reticle comes from the Latin "reticulum," meaning "net." Today, engraved lines or embedded fibres may be replaced by a computer-generated image superimposed on a screen or eyepiece. There are many variations of reticles, of which crosshairs are the most common one.