Pressure recovery
For streamline shapes, the air pressure changes as it flows around the body, initially decreasing as it is accelerated toward the point of maximum thickness, then increasing again toward its original pressure as the air is decelerated during its flow to the aft edge of the body. This increase in pressure along the aft portion of a body is referred to as "pressure recovery".
If this deceleration (and resulting pressure gradient) is not gentle enough, the flow can seperate from the body, leading to increased drag. If everything is done just right, the pressure can be fullly recovered, and the flow remain fully attached (and mostly laminar), all the way to the training edge of the body.
One characteristic of low drag laminar shapes is a reflex curve on the aft portion of the body, such as can be observed in the shape of Van's "pressure recovery" wheel pants.