I think you're referring to the layback angle, as pointed out by Mark Pav.

With the neck parallel to the body, like Fenders, the strings are close to the body, and the bridge is low.

Laying the neck back from the body, like Gibsons, brings the strings across at an angle that leaves lots of room between the strings and body. The bridge is up high.

Just another set of factors to consider when you're deciding on which guitar is more comfortable to play.