Gree’s barcode is in the Unified Product Code (UPC) format.
UPC code U is characterized by a fixed-length, continuous barcode. It is currently mainly used in the United States and Canada. Due to its wide range of applications, it is also called a universal barcode. The UPC code can only be used to represent numbers, so its character code set is the numbers 0~9. There are five versions of UPC codes: A, B, C, D, and E.
Extended information:
UPC
abbr.
=universal product code universal product code (scanned for checkout, inventory, etc. )
upc
abbr.
=universal production code Universal product number (code)
As early as the late 1940s, Two American engineers, Joe Woodland and Beny Silver, began to study the use of bar codes to represent food items and corresponding identification system equipment, and obtained a U.S. patent in 1949.