It is a small button (though sometimes a rod, such as on the Ruger series of .22 LR handguns, which are not slide pistols), generally located just behind the ejection port on the slide of the handgun that pops up to indicate the presence of a round in the chamber.

Génot and Brogliato have studied in great detail the rod dynamics in the neighborhood of a singular point of the phase space, when the rod is sliding.

The heavy rods slide into the timber rack.

Zaria gasped helplessly as his massive rod slid another blazing fraction deeper.

The rod can slide and rotate freely while in the hole.

Niall took it from him, located the concentric circle in the metal, and pressed it; the rod slid open.

The rod slid home in dead flesh and the distended gut vented gasses accumulated in the four days since death had occurred, hissing up into the naked man's face.

He seemed to come from the humming oily centre of the machine where the polished rods are sliding, and the pistons thumping; he grasped things so firmly but so loosely; he made the others appear like old maids cheapening remnants.