"Roll angle" refers to the tilt or rotation of an object around its central axis. It describes how much an object is inclined or turned sideways in relation to its normal or original position. Full definition
Trying different rolling angles and positions will target alternative areas of the muscle. (blog.bridgeathletic.com)
A built - in joystick lets you adjust your camera tilt and roll angles on the fly with three standard shooting modes. (geekwrapped.com)
The geometry was further optimized for linear torque build up and corner - exit precision, while Roll angle was decreased due to a shorter roll - moment arm, resulting in enhanced grip. (topspeed.com)