Reading reports in a multi-currency environment
Billings includes many reports that display values that are calculated from multiple clients. Each one of these clients can have a different currency. Hence, showing the aggregate totals in your base currency can be tricky due to constant variations in exchange rates.
In cases like this, Billings will display a ~ in front of "Totals" (or variations of that word or with no word at all). This indicates that the aggregate totals in base currency are approximate and based on the current exchange rates (as specified in the Currencies preference pane).