When we quote the currency what is the preferred method:
My preference is
10 BTC
and
10 bitcoins
As far as capitalization:
The convention I hold to quite carefully is to call the technology "BitCoin" [Edited: "Bitcoin"] and the money itself "bitcoins". This is largely so that even at the beginning of a sentence it can be clear whether I am referring to specific coins or the technology as a whole. It is an arbitrary choice, but I feel it improves communication of the concepts.
As far as the symbol, I'm not sure. I've seen 10 USDs and 10 USD both used. I'm sure the journalist style book has the proper use.
Now instead if we just used Ƀ10 instead. it wouldn't matter.
Universal Bitcoin Logo Alternative
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http://www.ecogex.com/bitcoin/