That's one of the Halstead metrics (https://en.wikipedia.org/wiki/Halstead_complexity_measures https://en.wikipedia.org/wiki/Halstead_complexity_measures). It's

That's one of the Halstead metrics (https://en.wikipedia.org/wiki/Halstead_complexity_measures https://en.wikipedia.org/wiki/Halstead_complexity_measures). It's all based on the number of operands and operators in your code. To make things simpler and practical, FTA combines these metrics with cyclomatic complexity (effectively the number of logical paths), normalizes them and produces a single number with accompanying 'assessment'.