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This calculator (as do many other CASIO scientific calculators) uses one and the same key for both the constant π as well as exponents. This works as follows. When you first enter digits, the "EXP"-key will enable you to enter the numbers exponent, otherwise it will enter the constant π.
As a calculator this one is great. It has almost everything you’ll ever need, including binary/hexadecimal/octal calculations, all kinds of statistical functions, and also has the familiar programming language also found in similar CASIO calculators.