Bokeh
The aesthetic shape of out-of-focus highlights — the glowing discs a lens's aperture leaves beyond the focal plane.
The word comes from Japanese boke (ボケ, "blur") and gained its h in an English photography magazine around 1997 so it wouldn't rhyme with "broke". In a real camera every point of light off the focal plane takes the aperture's shape — a circle or polygon — and the rounder the aperture, the softer the bokeh. Games imitate the effect to fake cinematic optics.
Cheap depth of field just blurs neighbouring pixels (gather), but then the characteristic discs disappear. Pricier bokeh DoF does the opposite: every sufficiently bright pixel is splatted out (scatter) as an aperture-shaped sprite, so a streetlight in the background becomes a glowing hexagon exactly as in a real lens. It looks expensive and costs accordingly.