Sometimes when you're using a computer, you get into typing mode. Call it laziness if you want, but you might not really feel like accessing a symbol palette or catalog to insert the symbol or command that you need. Incidentally, the first seven shortcuts also work on the handheld:
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To enter π, type pi.
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To enter θ, type theta.
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To enter ∞: type infinity.
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To enter ≤, type
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To enter ≥, type >=.
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To enter √, type sqrt(...).
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To enter �?, type abs(...).
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To enter i (the imaginary constant), type @i.
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To enter e (natural log base e), type @e.
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To enter ° (degrees), type @d.
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To enter r (radians), type @r.
