Leonardi discusses the misalignment and alignment of technology's material features and social interactions. Dislocations are a type of line defect involving the misalignment of these planes. Non-precision gear couplings use backlash to allow for slight angular misalignment. Due to the shortened jaw, there is a chance of tooth misalignment or tooth crowding. The gear teeth in a gear coupling have high backlash to allow for angular misalignment. There are two types of misalignment&colon; parallel and angular misalignment. A correlation between misalignment and vibration signature could not be discerned. Principal among these is clock/data misalignment, or clock skew. Magnetic encoders are also relatively insensitive to vibrations, minor misalignment, or shocks. Additional misalignment errors are discussed below. Continuous welded rail is generally used to reduce track vibrations and misalignment. Most often, the outcome is horizontal misalignment. This is theoretically possible through the misalignment mechanism. Radiographies generally need to be taken on weightbearing feet in order to detect misalignment. "Exo" describes outward or divergent misalignment.