Lately I have noticed some confusion about ingredients, supplies, and brands because there are differences in meaning depending on what country you are in. Is anyone interested in the idea of creating a glossary where we could give specifics, with differences between countries/regions detailed? (A globalwikicookiepedia?) 
For example, in Germany cream of tartar comes mixed with baking powder, or you can purchase it as crystals from an apothecary. In the USA, cream of tartar is a very fine white powder, not mixed with anything, and available at most grocery stores. (Thanks Laegwen for the info!) Someone in Germany who made a royal icing recipe from the US might end up with large crystallized bits of cream of tartar blocking their small icing tips, or icing with unwanted baking powder mixed into it.
Have you experienced any of these confusing issues? Would you be interested in the information, or do you have something to contribute? Also, is this a single forum topic, or a larger feature possibility?
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