Correct normalisation terminology
This is a bit unusual because you are throwing away information on the sign: The vectors (-2.998, 8.0, 2.5) and (2.9998, 8.0, 2.5) yield the same result.

Therefore I do not think there is a standard term for this procedure.
A clear comment in your code could be 'Take the absolut value and normalize by the sum of all values' or, if you are feeling mathematical today, 'Take the absolute value and normalize by the $L^1$-norm'.