"..the Imperial Scouts use a standard one line planet/system description called the Universal Planetary Profile (UPP for short) to code the qualities and characteristics of worlds. The UPP consists of single letters or digits to indicate starport or spac eport, six basic characteristics (size, atmosphere, hydrographics, population, government, and law level), and a technological index. Additional material such as trade classifications and remarks can be added to this UPP for elaboration."
( taken from the Imperial Scouts Training Manual)
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'Quick UPP' by david@innocom.demon.co.uk