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What is the funny-looking "i" in the palette?
Now that I've found the palette, I wonder what some of the symbols in it mean. Since there is vanishingly small info on the notebook interface (in 3.0), I spent quite a bit of time looking thru the help files and the book but found no clues what this funny i is (it has two vertical bars, not one plus a dot). At first, I thought it meant Root[-1] but only capital I works for that, I tried it. Any clues would be appreciated.