X + Y

Add

X||Y

Concatenate; for example abc||def returns abcdef.

X/Y

Divide; for example, 18/3 returns 6.

X ** Y

Exponentiate; for example, 2**8 returns 256.

FACTORIAL or X!

Return the factorial of the given integer; for example, 5! returns 60.

X % Y

Modulo; for example 7 % 3 returns 1, because seven divided by 3 leaves a remainder of 1.

X * Y

Multiply.

-X

Negate (unary operator); for example, -(1) returns -1 and -(-1) returns 1.

X - Y

Subtract.