MONEY
The uptight ones who probably got straight A's and followed all the rules as children only consider USD, EUR,JPY, GBP, and CHF as major currencies. Then they label AUD, NZD, and CAD, as 'commodity currencies.
These three letters are known as is04217 currency codes. By 1973, the international organization for stadardization [iso] established the three letters codes for currencies that we use today. other nickname for USD are green backs, bones ,benjis, benjamins, cheddar, paper ,loot, cheese bread.
All of that is old school now, compared to cryptocurrencies (bitcoin)/an asset that double it role as a currency, it code name BTC which is the most traded cryptocurrency in the exchange today, I have had a bit of bad experience with forex trading I don't know if it because I was not knowledgeable about trading and also depended so much on their party.
Since I was introduced to forex trading via a third party, so my experience was not a favourable one and at that, I won't want to ever repeat the same again.