This question Detect 1-time credit cards on SO is tagged 'bin', presumably for 'bank identification number', but that could easily have been used for something else. However the tag pages and searching for the tag return completely empty pages:
as does the hover pop-up for the tag. It's a cross-site problem too
I've tried this too with other likely magic filename tag names (e.g. aux, usr, nul, null, com1) but no problems.