Postal Alpha Numeric Encoding Technique

The Postal Alpha Numeric Encoding Technique (PLANET) barcode was used by the United States Postal Service to identify and track pieces of mail during delivery – the Post Office's "CONFIRM" services. It was fully superseded by Intelligent Mail Barcode by January 28, 2013.

Source: Wikipedia — Postal Alpha Numeric Encoding Technique (CC BY-SA 4.0)