'#' is commonly called either "hash" or "pound", and "tag" as a suffix just describes this tagging use in context. For an apples-to-apples comparison you'd be

'#' is commonly called either "hash" or "pound", and "tag" as a suffix just describes this tagging use in context. For an apples-to-apples comparison you'd be saying "poundtag", but good luck getting that to catch on. :)