Argument used to choose the suffix (thousand, million, etc) that is used to pronounce large amounts of money. For example it can be used to disambiguate between "two thousand five hundred dollars" and "two point five thousand dollars". If implemented, engines should support at least "1000", "1000000", "1000000000" and "1000000000000". Example: if the TtsSpan.ArgIntegerPart argument is "10", the TtsSpan.ArgFractionalPart argument is "4", the TtsSpan.ArgQuantity argument is "1000" and the TtsSpan.ArgCurrency argument is "usd", the TTS engine may pronounce the span as "ten point four thousand dollars". With the same example but with the quantity set as "1000000" the TTS engine may pronounce the span as "ten point four million dollars". Can be used with TtsSpan.TypeMoney.