no not many people have ever heard of the octothorpe name in my circles it was called the number sign after the phone companies usage on keypads until about five to ten years ago the last few years online seeming to lead the pack and culture started to call it a pound sign always known to expeditor people for weight always appearing at the end of a number eg cw both of those appear to be usages and not the symbol's name now i was told loosely that it was an octothorpe but since have discovered the term may be a broad one that covers many eight sided figures what else either way a redirect from these usages to the proper name would be in order for a dictionary of any merit the proper name brings us back to a conundrum