The World's Major Currencies and Their Symbols
$ - US dollar - USD
€ - Euro - EUR
£ - British pound - GBP
¥ - Japanese yen - JPY
$ - Australian dollar - AUD (same symbol as the US dollar)
$ - Canadian dollar - CAD (same symbol as the US dollar)
$ - Hong Kong dollar - HKD (same symbol as the US dollar)
CHF - Swiss Franc - CHF (no special symbol)
The dollar sign, the most common currency symbol, is the most storied. No one knows precisely how the symbol came to be, possibly having roots in spanish pesetas or the early days of the United States. The pound sign is a variation on the Roman capital L, which was used as a weight, called librum.
As for the newer Euro, the letter E, which the symbol resembles, stands for both the Greek letter epsilon, and Europe itself. It's claimed that the two bars crossing and somewhat creating the E were placed to indicate stability and reassure investors at the new currency's launch. However, the Japanese yen already had two horizontal crossbars over its Y, and the US dollar is often represented with two vertical crossbars. It's clear that crossbars were more precisely intended to imply membership in a family of already-existing extremely stable currencies.