Items on the ground, tables, and wherever are highlighted somehow. They may glow, glitter, have name tags shown, or otherwise blatantly give off their location. Often accompanied by an unexplained floating off the ground effect.
Alternate names: Item glow, Floating items
The first video game about Item highlight was released in 1994.
This also includes other variations that accomplish the same, such as a targeting rectangle identifying the object and any other methods to make items and other things you can carry or interact with easy to spot.