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As much as we may dislike them, the stickers or labels attached to fruit speed up the scanning process at checkout.
Cashiers no longer need to distinguish a Fuji apple from a Gala apple, a prickly pear from a horned melon, or a grapefruit from an ugli fruit.
They simply key in the PLU code _ the price lookup number printed on the sticker _ and the market's computerized cash register identifies the fruit by its PLU.
The numbers also enable retailers to track how well individual varieties are selling.
For conventionally grown fruit, the PLU code on the sticker consists of four numbers. Organically grown fruit has a five-numeral PLU ...
Source: HighBeam Research, Sticky but useful fruit labels.(Knight Ridder Newspapers)