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Here is another large Queensland Government Railways from . This one commemorating $ CCCCCCIↃↃↃↃↃↃ revenue for 1969 - 1970. According to tuomas.salste.net/doc/roman/49 that equals $1,004,800. The locomotive is a diesel, possibly 1400 or 1600 class?

I haven't encountered Ↄ before, but apparently Ↄ on its own is 1/48? CIↃ = 1,000, CCIↃↃ = 10,000, etc. So I wonder if the $1,004,800 is correct, or a rounding error and it should just be $1,000,000 even? Can any numeral scholars confirm please?

Thanasis Kinias

@CoinOfNote should, I think, just be $100 million (each additional C/Ↄ pair multiplying by 10) – not sure where the 48 is coming from!

@tkinias Thanks! That makes sense, I wasn't familiar with it and there aren't a lot of sites explaining how it works.

@CoinOfNote the Wikipedia article on Roman numerals is actually quite helpful here

@tkinias Thank you! I did search but I think I found a different symbol for the backwards c than the one the Wikipedia page uses so it didn't immediately come up. You are right though, the Wikipedia article is very informative

@CoinOfNote there’s a different character Ɔ (actually a letter) that looks the same but it's a different Unicode codepoint

@tkinias I thought that might be the case - also a lot of "roman number converters" online only do simple numbers and don't understand the apostrophus or vinculum methods for large numbers. This post on Reddit agrees with your 100,000,000 value for my original cccccciↃↃↃↃↃↃ (I'm still not sure if I'm using the right Ↄ!)