Turkey did a 1,000,000:1 conversion a while back. Before that you could almost say that the local currency was millions.

- "How much is this book?"

- "9 million"

- "Here's 10 million"

- "And one million in change, sir"

OK, so that only worked up to a certain value. No one would say their rent was "1,000 million". In that case, the currency was billions!