Code 39: The Rugged Alphanumeric Standard

Code 39, also known as "Code 3 of 9," was the first alphanumeric symbology ever developed. It remains a staple in industrial and government sectors.

1. Beyond Numbers

One of the greatest strengths of Code 39 is its ability to encode uppercase letters (A-Z), digits (0-9), and a few special characters (-, ., $, /, +, %, and space).

2. Self-Checking Design

Code 39 is "self-checking," meaning a single print defect is unlikely to result in a "substitution error" (reading the wrong character). This makes it ideal for harsh environments like automotive assembly lines or outdoor equipment tracking.

Limitation:

Code 39 is a "low-density" barcode, meaning it takes up more horizontal space than Code 128 for the same amount of data.