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Anonymous
It depends on the optical design, series, period of manufacture, and sometimes just marketing.
Summicron refers to their standard lenses, basically the equivalent of Zeiss's Planar lenses.
Summilux refers to their line of super-fast lenses. For example, the 25mm f/1.4
Elmar and Elmarit, as far as I can tell, are the same thing but made during different periods. They are both tessar-type standard and short telephoto lens designs.
APO stands for apochromatic, meaning that the lens emploies a certain kind of correction for chromatic abberation.
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