Forex pair is different from price unit.
BTC/USD => 1 BTC = 600 USD
NXT/BTC => 1 NXT = 0.00009544 BTC
Doesn't it bug you that these are upside down?
/ usually means something like 'per', so BTC/USD should be BTC per USD
If they were up the right way, you could get, say, NXT in USD by looking at NXT/BTC*BTC/USD and the untis make sense (cancel the BTC).
Trivial i guess, just bugs me.
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