Going back to our Australian and Singapore dollar trade example above, the way you pair currencies on the foreign exchange is always how much of the second pair (quote currency) is needed to purchase one unit of the first pair (base currency).
With AUD/SGD, AUD is your base currency and SGD is your quote currency and you would need $1.04 Singapore dollars to purchase one unit or dollar of Australian dollars. So, the currency pair would be seen as $1.04 on the forex market.
Every currency has a three-digit code, for example the Great British Pound is the GBP and the US dollar is written as USD.
Discover more forex terminology in our guide to forex trading.