cbrn:RollValue

An object's orientation (e.g., radiation detection instrument, radiation detector, or measured item) with respect to the axis running from the front to the back of the object.  Its value is the angle subtended by a line defined by the objects left-to-right axis and a line defined by the same axis when it is aligned with the horizontal plane. The angle range is from "-180.0" to "+180.0" degrees. A value of zero implies the object's body is not rotated about the front-to-back axis and its left-to- right axis is aligned with the horizontal plane (though the object may be inclined); positive values are clockwise rotations about the front-to-back axis when viewed from behind the object and looking towards the direction to which the object is pointing; negative values are counterclockwise rotations.