Most storage devices that do not require vision and a brain to read data fall into this category. Electromagnetic data may be stored in either an analog data or digital data format on a variety of media.
Direct Tripwire Alarm - The wire placed across the path is directly connected with the cord, wire or string placed across the particular path. Laser Tripwire Alarm - An invisible laser, typically an infra-red, is used instead of a cord or string.
Archwire-The metal wire that is attached to the brackets and used to move the teeth. Band-The metal ring that is cemented to a tooth for strength and anchorage. Braces-A word commonly used to describe a fixed orthodontic appliance, usually comprised of brackets, bands and wires.