Hypatia offers a large number of operators. They include those that you'd expect from a scientific calculator, but also some that you would not that easily find elsewhere (like normal distributed random numbers). Others offer shortcuts in calculations that you could, if more complicated, do without them (like the six percentage operators).
Do not worry, that all these operators exist does not mean you have to know them all by heart — most of them you will probably never need, but they are there if you do.
If you still miss operators that would be useful for your purposes, you can create them yourself (see page User Defined Operators in chapter "Insert Files and User Defined Elements").
1-Argument Operators: Arithmetic 1-Argument Operators, Trigonometric Operators, Limit Operators, "IS" Operators, Random True Operator, Measurement Unit Conversion Operators, Large Number Units.
2-Argument Operators: Arithmetic 2-Argument Operators, Percentage Operators, Rounding Operators, Limit Operators, Random Number Operators, Compare and Logical Operators, 2-Argument Unit Conversion Operator.
n-Argument Operators: Statistical Operators, The ITEM Operator, The n-Argument Delimiter.
Pseudo Operators: ~, WHISK, DONE.
Constants: PI, TAU (PI times 2), E (Euler's number), PHI (the "golden ratio").
Pseudo Constants: RAND, DUP, I, ISLOOP, PASSES, TIME, The TIME0 Command.