In Canada we have SIN. It's not Original, it's the Social Insurance Number, since the 1960s. For a little bit, it threatened to go the way of the SSN, but the Federal gov't throttled it back. For example, for a while your Provincial medical number (also confidential, right) might have been a version of your SIN. But they stopped that a couple of decades back. AFAIK, SIN is now used only for income tax-related matters and pensions. Somehow fitting that, as, "the wages of SIN is death". Which must mean that the number is no longer useful to you once you've popped yer clogs.