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A bar code is a Tau'ri identification system. When the Destiny expedition evacuated to the Destiny after the Battle of Icarus Base they brought with them a number of crates full of supplies from the base. All of these crates were labeled using only bar codes, however, the expedition did not have any bar code readers with them. Due to this they had to search through them all manually to see what made it through with them. (SGU: "Air, Part 2")