Crosshairs

Crosshairs are marks that indicate the absolute center of the camera framing and are indicated only within the operators viewfinder or can be toggled on and off on a digital display monitor of a digital camera system. 

Framing a shot in the "Crosshairs" is when the camera opearator keeps the subject of the shot in the center of frame as opposed to using asymetrical or 'rule of thirds' framing.