NLS-Glossary

A bar code verification term. Substitution error rate. The rate of occurrence of incorrect characters.                                                                                                                            

The surface on which a bar code field is printed. Can be a label, tag, or paper supply.                                                                                                                                                 

is equivalent to a laser diode without a resonatorIts radiation is based on an amplified spontaneous emission and offers the brightness of laser diodes combined with the low coherence length of LEDs. This equals a larger optical bandwidth of the emitted radiation. Similar to edge-emitting laser diodes, SLEDs have a p-n junction and are operated under forward bias. Unlike edge emitters, SLEDs do not have a resonator; thus, a standing wave cannot form. This leads to the aforementioned spontaneous amplified emission.

The term "symbol" refers to the physical elements that encode the data: the lines and spaces or squares (or dots) and spaces.                                                                           
 

The distance between the outside edges of the quiet zones on the two ends of a bar code field.                                                                                                                                

The term "symbology" refers to the rules by which the data is encoded into the physical elements of the symbol. Sometimes, the same data can be captured by different symbols, and choices must be made about which symbology fits the users' needs best. Depending on the symbology and application, users may be able to customize everything from the size and color of a barcode symbol to its industry function.