I think this notation of counting zeros is greatly confusing ... kk, mm, kkk...  

So, k is thousand, so three zeros, 1,000. kk is thousand-thousand, so ... 6 zeros, 1,000,000. You could just call it 1 million . And kkk means... three thousands, wait, no, three times three zeros, so ... *counts fingers* 1 billion.

Now, m is usually a million for me, e.g. when writing 10M (with a capital M). And you write mm, so ... million-million? 12 Zeros?   1,000,000,000,000? That would be 1000 billion, or 1 Trillion. I doubt that's what you're talking about   (given that the total supply is only 50 billion).

Oh and to make it even more confusing you are not only saying 1 mm, but 10 of them. Some people use constructions like 100kk or so.   So how many zeros is that? LOL.

So I would recommend to just use the names. Thousand, Million, Billion. Use K, M, B for abbreviating it. Then nobody gets confused or has to grab his calculator.