Accuracy   Active Tag
A bar code verification term. The determination of whether any element width, or intercharacter gap width, differs from its nominal width by more than the printing tolerance.
An RFID tag with a transmitter that sends data to a reader, rather than reflecting back a signal. Most active tags have their own power source, normally a battery.
Air interface protocol   Antenna
The rules that control how RFID readers and tags communicate.
A conductive element in an RFID reader or tag that enables the sending and receiving of data.
Anti-collision   Applicator
Term for methods to prevent radio waves from multiple devices interfering with each other.
Anti-collision methods provide for a reader to read multiple RFID tags nearly simultaneously.
Applicator is an accessory designed to automate the label printing and application process. The labels are applied with a tamp pad by means of a pneumatic cylinder that moves between the starting position and the labeling position.
ASCII   Asian Font
The character set described in the American National Standard Code for Information Interchange. ASCII is used for information interchange between data processing systems, communications systems, and associated equipment.
A font that uses two bytes to represent each character (Chinese Simplified, Chinese Traditional, Japanese and Korean etc.)
Aspect ratio   Asset Tracking
A bar code verification term. In a bar code symbol, the ratio of bar code symbol height to symbol length.
Tracking the movement of physical assets. By scanning barcode tags/labels to collect the information. An asset tracking system can record the location and usage of the assets and generate various reports.
Asynchronous communication   Autodiscrimination
Also referred to as start/stop transmission. Every character transmitted has special bits attached, telling the receiving device when the data begins and ends. Data is transmitted independently with no associated clock. See also Synchronous communication.
The ability of bar code scanning and decoding equipment to recognize more than one symbology.
Auto ID   Auto-ID Labs
Automatic Identification. Various methods that allow machines to identify objects independent of human intervention. Auto-ID technologies include bar codes, voice recognition, retina scans and RFID.
Research group for RFID, barcoding and other automatic identification technologies. The Auto-ID Labs network grew out of the original MIT Aut0-ID Center project. It includes seven research universities on four continents. The Center pioneered a network for using RFID to globally track products.
Average Background Reflectance    
A bar code verification term. Expressed as a percent. See Reflectance.