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In Kenya, AA, AB and other grades are used to classify lots, and they are just indicators of screen size. They don't have any sign of cup quality. In Kenya, the AA level is equivalent to a 17 or 18 screen (17 or 18 64 inches). AA cups tend to be more expensive at auction, although this grade does not indicate the quality of the cup, while AB cups from better farms may be better.
PB means "dried nuts. "most coffee fruits contain two kinds of seeds whose surfaces are flattened (the 'coffee beans' we are familiar with), but sometimes only one of the two seeds is fertilized, and a single seed develops without anything to squash it." These oval (or pea-shaped) beans are called peas. Generally speaking, about 5% of coffee beans have this special experience.
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