We say that expressions are in normal form when there are no more evaluation step that can be taken, or, put differently, when they’ve reached an irreducible form.
The syntax of a function can be read like this:
triple x = x * 3 -- o----o o o---o
Being the triple the name of the function, the first x the parameter, and
the body of the function is everything that is in the right of the equal sign.
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