I'm writing a scientific paper, and I seen a lot of times the abbreviation # for 'number of' or similar, for example if we are counting events, I seen expressed the results as,
# type1 = 100, # type2 = 140 ...
Is a formal way to express it? or is colloquial, I could not find this information explicitly nowhere.
$$
is to use mathematical typesetting like the one available in LaTeX.