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Arabic numerals, Greek letters, capital letters with a special meaning, and modifiers prefixed to the names of chemical compounds should be disregarded for alphabetization purposes unless they constitute the only difference between entries:
When a Greek letter stands by itself as a separate entry, Romanize it, e.g. Pi, Gamma.
Abbreviations for scientific terms should generally not be used at the beginning of a main entry except (i) in a cross-reference, (ii) as part of the name of an enzyme or compound, or (iii) when more than one species is listed for a biological genus:
Generic names in biology should in any case be abbreviated after the main entry and alphabetized by epithet as a space-saving device:
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